checkpatch: suppress errors triggered by short patch

When the last hunk of a patch is short it will trigger errors from
checkpatch:

    Use of uninitialized value in pattern match (m//)
	    at /usr/local/bin/checkpatch.pl line 394.
    Use of uninitialized value in concatenation (.) or string
	    at /usr/local/bin/checkpatch.pl line 397.
    Use of uninitialized value in pattern match (m//)

Avoid touching beyond the last line.  Reported by Julien Brunel.

Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Cc: Julien Brunel <brunel@diku.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 457f87460d6e..5382f7287397 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -408,6 +408,7 @@ sub ctx_statement_block {
                 # context.
                 if ($off >= $len) {
                         for (; $remain > 0; $line++) {
+                                last if (!defined $lines[$line]);
                                 next if ($lines[$line] =~ /^-/);
                                 $remain--;
                                 $loff = $len;