[PATCH] checkpatch: do not exit in main process subroutine

["zhangwei(Jovi)" <jovi.zhangwei@huawei.com>]

Currently checkpatch program exit when process empty file,
This will cause issue when @ARGV include many files ready to check.

For example, there may have Module.symvers empty file in kernel directory.

[root@jovi ~]# scripts/checkpatch.pl -f kernel/*

then many file "after" empty file will not be check by script.
so disallow exit in main process subroutine.

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
---
 scripts/checkpatch.pl |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index b28cc38..6924733 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3634,19 +3634,19 @@ sub process {
 	# If we have no input at all, then there is nothing to report on
 	# so just keep quiet.
 	if ($#rawlines == -1) {
-		exit(0);
+		return $clean;
 	}

 	# In mailback mode only produce a report in the negative, for
 	# things that appear to be patches.
 	if ($mailback && ($clean == 1 || !$is_patch)) {
-		exit(0);
+		return $clean;
 	}

 	# This is not a patch, and we are are in 'no-patch' mode so
 	# just keep quiet.
 	if (!$chk_patch && !$is_patch) {
-		exit(0);
+		return $clean;
 	}

 	if (!$is_patch) {
-- 
1.7.9.7