[CLEANUP] stream_sock: MSG_NOSIGNAL is only for send(), not recv()

We must not set this flag on recv(), it's not used, it's just for
send().

src/checks.c

@@ -791,7 +791,7 @@ static int event_srv_chk_r(int fd)
 	 * but the connection was closed on the remote end. Fortunately, recv still
 	 * works correctly and we don't need to do the getsockopt() on linux.
 	 */
-	len = recv(fd, trash, sizeof(trash), MSG_NOSIGNAL);
+	len = recv(fd, trash, sizeof(trash), 0);
 	if (unlikely(len < 0 && errno == EAGAIN)) {
 		/* we want some polling to happen first */
 		fdtab[fd].ev &= ~FD_POLL_IN;

src/stream_sock.c

@@ -321,18 +321,7 @@ int stream_sock_read(int fd) {
 		/*
 		 * 2. read the largest possible block
 		 */
-		if (MSG_NOSIGNAL) {
+		ret = recv(fd, b->r, max, 0);
-			ret = recv(fd, b->r, max, MSG_NOSIGNAL);
-		} else {
-			int skerr;
-			socklen_t lskerr = sizeof(skerr);
-
-			ret = getsockopt(fd, SOL_SOCKET, SO_ERROR, &skerr, &lskerr);
-			if (ret == -1 || skerr)
-				ret = -1;
-			else
-				ret = recv(fd, b->r, max, 0);
-		}
 
 		if (ret > 0) {
 			b->r += ret;