util/lint: list files with whitespace issues

Change-Id: I8ae13f62c6e2cd87278fefab8de5faf0d1bc0a90
Signed-off-by: Balazs Vinarz <vinibali1@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/30988
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

util/lint/lint-stable-003-whitespace

@@ -20,7 +20,7 @@ INCLUDELIST="src util payloads Makefile* toolchain.inc"
 
 # shellcheck disable=SC2086,SC2046
 if uname | grep -qi "linux"; then
-	grep -l "[[:space:]][[:space:]]*$" \
+	grep -n -H "[[:space:]][[:space:]]*$" \
 		$(git ls-files $INCLUDELIST | \
 			grep -Ev "($EXCLUDELIST)" ) | \
 		sed -e "s,^.*$,File & has lines ending with whitespace.,"