fix segfault

Author: davidleitw

address/inet_aton_ex.c

@@ -1,12 +1,14 @@
 #include <stdio.h>
+#include <stdlib.h>
 #include <arpa/inet.h>
 
 int main()
 {
     const char *addr1 = "8.8.8.8";
     const char *addr2 = "192.168.1.256";
 
-    struct in_addr *naddr1, *naddr2;
+    struct in_addr *naddr1 = (struct in_addr*)malloc(sizeof(struct in_addr));
+    struct in_addr *naddr2 = (struct in_addr*)malloc(sizeof(struct in_addr));
 
     if (inet_aton(addr1, naddr1) == 0) {
         printf("inet_aton failed! Please check your input address.\n");