virsocket: Don't preserve errno in virSocketRecvFD()

When setting O_CLOEXEC flag on received FD fails the FD is closed
using VIR_FORCE_CLOSE(). But the call is wrapped in errno save
which is not necessary because VIR_FORCE_CLOSE() preserves  errno
value.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

src/util/virsocket.c

@@ -477,9 +477,7 @@ virSocketRecvFD(int sock, int fdflags)
     /* set close-on-exec flag */
     if (!MSG_CMSG_CLOEXEC && (fdflags & O_CLOEXEC)) {
         if (virSetCloseExec(fd) < 0) {
-            int saved_errno = errno;
             VIR_FORCE_CLOSE(fd);
-            errno = saved_errno;
             return -1;
         }
     }