fs: compat: remove redundant check of nr_segs

nr_segs should never be less than zero as its type
is unsigned long, so let's remove this check.
Signed-off-by: NShawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

fs/compat.c

@@ -562,7 +562,7 @@ ssize_t compat_rw_copy_check_uvector(int type,
 		goto out;
 
 	ret = -EINVAL;
-	if (nr_segs > UIO_MAXIOV || nr_segs < 0)
+	if (nr_segs > UIO_MAXIOV)
 		goto out;
 	if (nr_segs > fast_segs) {
 		ret = -ENOMEM;