kbuild: fix export_report.pl

This patch fixes an annoying bug of export_report.pl missing the usages
of some exports.

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/scripts/export_report.pl b/scripts/export_report.pl
index 9ed00d9..08ceb42 100644
--- a/scripts/export_report.pl
+++ b/scripts/export_report.pl
@@ -112,7 +112,7 @@
 			next;
 		}
 		if ($state eq 2) {
-			if ( $_ !~ /0x[0-9a-f]{7,8},/ ) {
+			if ( $_ !~ /0x[0-9a-f]+,/ ) {
 				next;
 			}
 			my $sym = (split /([,"])/,)[4];