Fix compiler warning: addition result could be truncated before cast to bigger sized type

ares__get_hostent.c

@@ -194,7 +194,7 @@ int ares__get_hostent(FILE *fp, int family, struct hostent **host)
         memcpy(hostent->h_addr_list[0], &addr6, addrlen);
 
       /* Copy aliases. */
-      hostent->h_aliases = malloc((naliases + 1) * sizeof(char *));
+      hostent->h_aliases = malloc((((size_t)naliases) + 1) * sizeof(char *));
       if (!hostent->h_aliases)
         break;
       alias = hostent->h_aliases;

ares_expand_name.c

@@ -71,10 +71,10 @@ int ares_expand_name(const unsigned char *encoded, const unsigned char *abuf,
   const unsigned char *p;
 
   len = name_length(encoded, abuf, alen);
-  if (len == -1)
+  if (len < 0)
     return ARES_EBADNAME;
 
-  *s = malloc(len + 1);
+  *s = malloc(((size_t)len) + 1);
   if (!*s)
     return ARES_ENOMEM;
   q = *s;