Fixed possible crash or fail of option ip-add-membership with two parameters

sycls.c

@@ -1513,6 +1513,9 @@ void *Malloc(size_t size) {
       Error1("malloc("F_Zd"): out of memory", size);
       return NULL;
    }
+#if WITH_DEVTESTS
+   memset(result, 0x55, size);
+#endif /* WITH_DEVTESTS */
    return result;
 }
 
@@ -1540,6 +1543,18 @@ void *Realloc(void *ptr, size_t size) {
    return result;
 }
 
+/* Like Realloc(), but gets info about old size for overwrite test */
+void *Realloc3(void *ptr, size_t size, size_t oldsize) {
+   void *result = Realloc(ptr, size);
+   if (result == NULL)
+      return result;
+#if WITH_DEVTESTS
+   if (size > oldsize)
+      memset(result+oldsize, 0x55, size-oldsize);
+#endif /* WITH_DEVTESTS */
+   return result;
+}
+
 #if _WITH_TERMIOS
 int Tcgetattr(int fd, struct termios *termios_p) {
    int i, result, _errno;