align functions add_cidr() and add_range()

* call freeaddrinfo() before checking the prefix length in
  add_cidr()
* add a comment to the generator limit check in add_range()

src/fping.c

@@ -1282,6 +1282,7 @@ void add_cidr(char *addr)
         exit(1);
     }
     net_addr = ntohl(((struct sockaddr_in *)addr_res->ai_addr)->sin_addr.s_addr);
+    freeaddrinfo(addr_res);
 
     /* check mask */
     if (mask < 1 || mask > 32) {
@@ -1310,8 +1311,6 @@ void add_cidr(char *addr)
         inet_ntop(AF_INET, &in_addr_tmp, buffer, sizeof(buffer));
         add_name(buffer);
     }
-
-    freeaddrinfo(addr_res);
 }
 
 void add_range(char *start, char *end)
@@ -1355,6 +1354,7 @@ void add_range(char *start, char *end)
     end_long = ntohl(((struct sockaddr_in *)addr_res->ai_addr)->sin_addr.s_addr);
     freeaddrinfo(addr_res);
 
+    /* check if generator limit is exceeded */
     if (end_long > start_long + MAX_GENERATE) {
         fprintf(stderr, "%s: -g parameter generates too many addresses\n", prog);
         exit(1);