[PATCH 01/13] scripts/checkpatch.pl: Detect superfluous semicolon in C code

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

Display error when a commit contains superfluous semicolon:

  $ git show 6663a0a3376 | scripts/checkpatch.pl -q -
  ERROR: superfluous trailing semicolon
  #276: FILE: block/io_uring.c:186:
  +                ret = -ENOSPC;;
  total: 1 errors, 1 warnings, 485 lines checked

Reported-by: Luc Michel <luc.michel@greensocs.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
Cc: Paolo Bonzini <pbonzini@redhat.com>
---
 scripts/checkpatch.pl | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index ce43a306f8..11512a8a09 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1830,6 +1830,11 @@ sub process {
 			ERROR("suspicious ; after while (0)\n" . $herecurr);
 		}
 
+# Check superfluous trailing ';'
+		if ($line =~ /;;$/) {
+			ERROR("superfluous trailing semicolon\n" . $herecurr);
+		}
+
 # Check relative indent for conditionals and blocks.
 		if ($line =~ /\b(?:(?:if|while|for)\s*\(|do\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
 			my ($s, $c) = ($stat, $cond);
-- 
2.21.1