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fixed compiler warning "initialization dircards qualifiers from pointer target type"
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@@ -63,7 +63,7 @@ typedef s8_t err_t;
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#ifdef LWIP_DEBUG
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extern char *lwip_strerr(err_t err);
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extern const char *lwip_strerr(err_t err);
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#else
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#define lwip_strerr(x) ""
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#endif /* LWIP_DEBUG */
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