checkpatch: support function pointers for unnamed function definition arguments

Current unnamed function definition argument does not include function
pointer cases and it reports something like:

  WARNING: function definition argument 'void' should also have an identifier name
  +unsigned int (*dummy)(void);

Support function pointers for unnamed function arguments

Link: http://lkml.kernel.org/r/1505389925-31087-1-git-send-email-miles.chen@mediatek.com
Signed-off-by: Miles Chen <miles.chen@mediatek.com>
Acked-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

scripts/checkpatch.pl

@@ -5957,7 +5957,7 @@ sub process {
 
 # check for function declarations that have arguments without identifier names
 		if (defined $stat &&
-		    $stat =~ /^.\s*(?:extern\s+)?$Type\s*$Ident\s*\(\s*([^{]+)\s*\)\s*;/s &&
+		    $stat =~ /^.\s*(?:extern\s+)?$Type\s*(?:$Ident|\(\s*\*\s*$Ident\s*\))\s*\(\s*([^{]+)\s*\)\s*;/s &&
 		    $1 ne "void") {
 			my $args = trim($1);
 			while ($args =~ m/\s*($Type\s*(?:$Ident|\(\s*\*\s*$Ident?\s*\)\s*$balanced_parens)?)/g) {