Fix buffer size passed to inet_ntop()

Fixes https://github.com/cesanta/mongoose-os/issues/394

CL: Fix buffer size passed to inet_ntop()

PUBLISHED_FROM=4a6702527627ccbb780f45200274b09a28be69ee

mongoose.c

@@ -10093,7 +10093,7 @@ int mg_sock_addr_to_str(const union socket_address *sa, char *buf, size_t len,
       goto cleanup;
     }
 #else
-    if (inet_ntop(AF_INET, (void *) &sa->sin.sin_addr, buf, len - 1) == NULL) {
+    if (inet_ntop(AF_INET, (void *) &sa->sin.sin_addr, buf, len) == NULL) {
       goto cleanup;
     }
 #endif

src/mg_util.c

@@ -144,7 +144,7 @@ int mg_sock_addr_to_str(const union socket_address *sa, char *buf, size_t len,
       goto cleanup;
     }
 #else
-    if (inet_ntop(AF_INET, (void *) &sa->sin.sin_addr, buf, len - 1) == NULL) {
+    if (inet_ntop(AF_INET, (void *) &sa->sin.sin_addr, buf, len) == NULL) {
       goto cleanup;
     }
 #endif