checkpatch.pl: fix CAST detection

We should only claim that something is a cast if we did not encouter a
token before, that did set av_pending.

This fixes the operator * in the line below to be detected as binary (vs
unary).

kmalloc(sizeof(struct alphatrack_ocmd) * true_size, GFP_KERNEL);

Reported-by: Peter Chubb <nicta.com.au>
Signed-off-by: NFlorian Mickler <florian@mickler.org>
(cherry-picked from Linux kernel commit c023e4734c3e8801e0ecb5e81b831d42a374d861)
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Cc: Blue Swirl <blauwirbel@gmail.com>
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

scripts/checkpatch.pl

@@ -859,7 +859,7 @@ sub annotate_values {
 				$av_preprocessor = 0;
 			}
 
-		} elsif ($cur =~ /^(\(\s*$Type\s*)\)/) {
+		} elsif ($cur =~ /^(\(\s*$Type\s*)\)/ && $av_pending eq '_') {
 			print "CAST($1)\n" if ($dbg_values > 1);
 			push(@av_paren_type, $type);
 			$type = 'C';