checkpatch: indent checks -- stop when we run out of continuation lines

Ensure we terminate when there are no futher continuation lines when
trying to determine relative indent of conditionals and their blocks.

Reported-by: John Daiker <daikerjohn@gmail.com>
Signed-off-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index aa009a3b5b81..b6f267b72035 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1547,8 +1547,9 @@ sub process {
                                     $s =~ /^\s*#\s*?/ ||
                                     $s =~ /^\s*$Ident\s*:/) {
                                         $continuation = ($s =~ /^.*?\\\n/) ? 1 : 0;
-                                        $s =~ s/^.*?\n//;
-                                        $cond_lines++;
+                                        if ($s =~ s/^.*?\n//) {
+                                                $cond_lines++;
+                                        }
                                 }
                         }