lint: exclude *.hex files from whitespace checking

If one needs raw binary files, .bin extension cannot
be used due to settings in .gitignore. This patch
allows to use .hex files. To avoid lint checks on these
files, exclude the .hex extension from the test.

Change-Id: I4b503229d63694c48cce12ca8cd33ea58172af01
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: http://review.coreboot.org/8403
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/util/lint/lint-stable-003-whitespace b/util/lint/lint-stable-003-whitespace
index 47853ba..f13aa98 100755
--- a/util/lint/lint-stable-003-whitespace
+++ b/util/lint/lint-stable-003-whitespace
@@ -19,6 +19,6 @@
 # DESCR: Check for superfluous whitespace in the tree
 
 LC_ALL=C export LC_ALL
-grep -l "[[:space:]][[:space:]]*$" `git ls-files src util |egrep -v "(^3rdparty|^src/vendorcode/|^util/kconfig/|^util/nvidia/cbootimage$|\<COPYING\>|\<LICENSE\>|\<README\>|_shipped$|\.patch|\.bin$)"` | \
+grep -l "[[:space:]][[:space:]]*$" `git ls-files src util |egrep -v "(^3rdparty|^src/vendorcode/|^util/kconfig/|^util/nvidia/cbootimage$|\<COPYING\>|\<LICENSE\>|\<README\>|_shipped$|\.patch$|\.bin$|\.hex$)"` | \
 	sed -e "s,^.*$,File & has lines ending with whitespace.,"