checkpatch: allow simple character constants in #defines

Signed-off-by: NAndy Whitcroft <apw@canonical.com>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

scripts/checkpatch.pl

@@ -2911,6 +2911,7 @@ sub process {
 			    $dstat !~ /^(?:$Ident|-?$Constant),$/ &&			# 10, // foo(),
 			    $dstat !~ /^(?:$Ident|-?$Constant);$/ &&			# foo();
 			    $dstat !~ /^(?:$Ident|-?$Constant)$/ &&			# 10 // foo()
+			    $dstat !~ /^'X'$/ &&					# character constants
 			    $dstat !~ /$exceptions/ &&
 			    $dstat !~ /^\.$Ident\s*=/ &&				# .foo =
 			    $dstat !~ /^do\s*$Constant\s*while\s*$Constant;?$/ &&	# do {...} while (...); // do {...} while (...)