checkpatch: improve the TABSTOP test to include declarations

Declarations should start on a tabstop too.

Link: http://lkml.kernel.org/r/1b5f97673f36595956ad43329f77bf1a5546d2ff.1513976662.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 5190563..d246405 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3020,7 +3020,7 @@
 
 # check indentation starts on a tab stop
 		if ($^V && $^V ge 5.10.0 &&
-		    $sline =~ /^\+\t+( +)(?:$c90_Keywords\b|\{\s*$|\}\s*(?:else\b|while\b|\s*$))/) {
+		    $sline =~ /^\+\t+( +)(?:$c90_Keywords\b|\{\s*$|\}\s*(?:else\b|while\b|\s*$)|$Declare\s*$Ident\s*[;=\[])/) {
 			my $indent = length($1);
 			if ($indent % 8) {
 				if (WARN("TABSTOP",