lavf/network: check return value of setsockopt.

Signed-off-by: Jun Zhao <mypopydev@gmail.com>

libavformat/network.c

@@ -194,8 +194,11 @@ int ff_socket(int af, int type, int proto)
 #endif
     }
 #ifdef SO_NOSIGPIPE
-    if (fd != -1)
-        setsockopt(fd, SOL_SOCKET, SO_NOSIGPIPE, &(int){1}, sizeof(int));
+    if (fd != -1) {
+        if (setsockopt(fd, SOL_SOCKET, SO_NOSIGPIPE, &(int){1}, sizeof(int))) {
+             av_log(NULL, AV_LOG_WARNING, "setsockopt(SO_NOSIGPIPE) failed\n");
+        }
+    }
 #endif
     return fd;
 }