strlen() returns a size_t, which might be larger than int on some platforms

ares/ares__read_line.c

@@ -30,7 +30,8 @@
 int ares__read_line(FILE *fp, char **buf, int *bufsize)
 {
   char *newbuf;
-  int offset = 0, len;
+  int offset = 0;
+  size_t len;
 
   if (*buf == NULL)
     {