shmem: restore_shmem_content -- Use close_safe

Don't call close() with degative fd. For consistency
simply use close_safe here. All fds touched are initialized
either to valid fd or to value < 0 which pretty good handled
by close_safe helper.

CID 996212 (#1 of 1): Argument cannot be negative (NEGATIVE_RETURNS)
10. negative_returns: "fd" is passed to a parameter that cannot be negative.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

shmem.c

@@ -186,12 +186,12 @@ static int restore_shmem_content(void *addr, struct shmem_info *si)
 
 	}
 
-	close(fd_pg);
-	close(fd);
+	close_safe(&fd_pg);
+	close_safe(&fd);
 	return ret;
 
 out_close:
-	close(fd);
+	close_safe(&fd);
 err_unmap:
 	munmap(addr,  si->size);
 	return -1;