Changed initialization: many init functions are not needed any more since we now rely on the compiler initializing global and static variables to zero!

src/core/ipv4/igmp.c

@@ -113,8 +113,6 @@ igmp_init(void)
 
   IP4_ADDR(&allsystems, 224, 0, 0, 1);
   IP4_ADDR(&allrouters, 224, 0, 0, 2);
-
-  igmp_group_list = NULL;
 }
 
 #ifdef LWIP_DEBUG

src/core/ipv4/ip.c

@@ -55,17 +55,6 @@
 #include "lwip/stats.h"
 #include "arch/perf.h"
 
-/**
- * Initializes the IP layer.
- */
-void
-ip_init(void)
-{
-#if IP_REASSEMBLY
-  ip_reass_init();
-#endif
-}
-
 /**
  * Finds the appropriate network interface for a given IP address. It
  * searches the list of network interfaces linearly. A match is found

src/core/ipv4/ip_frag.c

@@ -85,14 +85,6 @@ static u16_t ip_reass_pbufcount;
 /* function prototypes */
 static void dequeue_packet(struct ip_reassdata *ipr, struct ip_reassdata *prev);
 
-/**
- * Initializes IP reassembly states.
- */
-void
-ip_reass_init(void)
-{
-}
-
 /**
  * Reassembly timer base function
  * for both NO_SYS == 0 and 1 (!).