fix compiler warning

tests/server/sws.c

@@ -183,11 +183,8 @@ static const char *doc404 = "HTTP/1.1 404 Not Found\r\n"
     "The requested URL was not found on this server.\n"
     "<P><HR><ADDRESS>" SWSVERSION "</ADDRESS>\n" "</BODY></HTML>\n";
 
-#ifdef SIGPIPE
+#if defined(SIGPIPE) && defined(HAVE_SIGNAL)
 static volatile int sigpipe;  /* Why? It's not used */
-#endif
-
-#ifdef SIGPIPE
 static void sigpipe_handler(int sig)
 {
   (void)sig; /* prevent warning */

tests/server/tftpd.c

@@ -484,7 +484,7 @@ int main(int argc, char **argv)
     sock = socket(AF_INET6, SOCK_DGRAM, 0);
 #endif
 
-  if (sock < 0) {
+  if(CURL_SOCKET_BAD == sock) {
     perror("opening stream socket");
     logmsg("Error opening socket");
     return 1;
@@ -543,7 +543,7 @@ int main(int argc, char **argv)
     from.sin_family = AF_INET;
 
     peer = socket(AF_INET, SOCK_DGRAM, 0);
-    if (peer < 0) {
+    if(CURL_SOCKET_BAD == peer) {
       logmsg("socket");
       result = 2;
       break;