Fix typos using codespell

Conservative strategy was used, maybe other typos remain.

Rebased: Simon Goldschmidt <goldsimon@gmx.de>

src/netif/ppp/chap_ms.c

@@ -33,7 +33,7 @@
  *
  *   Implemented LANManager type password response to MS-CHAP challenges.
  *   Now pppd provides both NT style and LANMan style blocks, and the
- *   prefered is set by option "ms-lanman". Default is to use NT.
+ *   preferred is set by option "ms-lanman". Default is to use NT.
  *   The hash text (StdText) was taken from Win95 RASAPI32.DLL.
  *
  *   You should also use DOMAIN\\USERNAME as described in README.MSCHAP80

src/netif/ppp/ipcp.c

@@ -1537,7 +1537,7 @@ static int ipcp_reqci(fsm *f, u_char *inp, int *len, int reject_if_disagree) {
     next = inp;
     while (l) {
 	orc = CONFACK;			/* Assume success */
-	cip = p = next;			/* Remember begining of CI */
+	cip = p = next;			/* Remember beginning of CI */
 	if (l < 2 ||			/* Not enough data for CI header or */
 	    p[1] < 2 ||			/*  CI length too small or */
 	    p[1] > l) {			/*  CI length too big? */
@@ -1589,7 +1589,7 @@ static int ipcp_reqci(fsm *f, u_char *inp, int *len, int reject_if_disagree) {
 	     * If he doesn't know our address, or if we both have our address
 	     * but disagree about it, then NAK it with our idea.
 	     */
-	    GETLONG(tl, p);		/* Parse desination address (ours) */
+	    GETLONG(tl, p);		/* Parse destination address (ours) */
 	    ciaddr2 = lwip_htonl(tl);
 	    if (ciaddr2 != wo->ouraddr) {
 		if (ciaddr2 == 0 || !wo->accept_local) {

src/netif/ppp/ipv6cp.c

@@ -913,7 +913,7 @@ static int ipv6cp_reqci(fsm *f, u_char *inp, int *len, int reject_if_disagree) {
     next = inp;
     while (l) {
 	orc = CONFACK;			/* Assume success */
-	cip = p = next;			/* Remember begining of CI */
+	cip = p = next;			/* Remember beginning of CI */
 	if (l < 2 ||			/* Not enough data for CI header or */
 	    p[1] < 2 ||			/*  CI length too small or */
 	    p[1] > l) {			/*  CI length too big? */

src/netif/ppp/lcp.c

@@ -1855,7 +1855,7 @@ static int lcp_reqci(fsm *f, u_char *inp, int *lenp, int reject_if_disagree) {
     rejp = inp;
     while (l) {
 	orc = CONFACK;			/* Assume success */
-	cip = p = next;			/* Remember begining of CI */
+	cip = p = next;			/* Remember beginning of CI */
 	if (l < 2 ||			/* Not enough data for CI header or */
 	    p[1] < 2 ||			/*  CI length too small or */
 	    p[1] > l) {			/*  CI length too big? */

src/netif/ppp/magic.c

@@ -196,7 +196,7 @@ u32_t magic(void) {
 /*** LOCAL DATA STRUCTURES ***/
 /*****************************/
 #ifndef LWIP_RAND
-static int  magic_randomized;       /* Set when truely randomized. */
+static int  magic_randomized;       /* Set when truly randomized. */
 #endif /* LWIP_RAND */
 static u32_t magic_randomseed;      /* Seed used for random number generation. */
 
@@ -231,7 +231,7 @@ void magic_init(void) {
  * magic_init - Initialize the magic number generator.
  *
  * Randomize our random seed value.  Here we use the fact that
- * this function is called at *truely random* times by the polling
+ * this function is called at *truly random* times by the polling
  * and network functions.  Here we only get 16 bits of new random
  * value but we use the previous value to randomize the other 16
  * bits.
@@ -254,9 +254,9 @@ void magic_randomize(void) {
  * Return a new random number.
  *
  * Here we use the Borland rand() function to supply a pseudo random
- * number which we make truely random by combining it with our own
- * seed which is randomized by truely random events.
- * Thus the numbers will be truely random unless there have been no
+ * number which we make truly random by combining it with our own
+ * seed which is randomized by truly random events.
+ * Thus the numbers will be truly random unless there have been no
  * operator or network events in which case it will be pseudo random
  * seeded by the real time clock.
  */

src/netif/ppp/pppoe.c

@@ -132,7 +132,7 @@ static void pppoe_clear_softc(struct pppoe_softc *, const char *);
 /* internal timeout handling */
 static void pppoe_timeout(void *);
 
-/* sending actual protocol controll packets */
+/* sending actual protocol control packets */
 static err_t pppoe_send_padi(struct pppoe_softc *);
 static err_t pppoe_send_padr(struct pppoe_softc *);
 #ifdef PPPOE_SERVER