UML - Fix recvmsg return value checking

Stupid bug - we need to compare the return value of recvmsg to the value of iov_len, not its size. This caused port_helper processes not to be killed on shutdown on x86_64 because the pids weren't being passed out properly.

---
 arch/um/os-Linux/file.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

Index: linux-2.6/arch/um/os-Linux/file.c
===================================================================
@@ -496,8 +496,7 @@ int os_rcv_fd(int fd, int *helper_pid_ou
 	n = recvmsg(fd, &msg, 0);
 	if(n < 0)
 		return -errno;
-
-	else if(n != sizeof(iov.iov_len))
+	else if(n != iov.iov_len)
 		*helper_pid_out = -1;
 
 	cmsg = CMSG_FIRSTHDR(&msg);

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