util/board_status: Only pass switch `-a` once to `git commit`

Change-Id: Iabcb26229401b03ad4ba2df0f78eee08f379aa03
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: http://review.coreboot.org/5172
Tested-by: build bot (Jenkins)
Reviewed-by: David Hendricks <dhendrix@chromium.org>

util/board_status/board_status.sh

@@ -202,7 +202,7 @@ if [ $UPLOAD_RESULTS -eq 1 ]; then
 
 	echo "Uploading results"
 	git add "${vendor}"
-	git commit -a -am "${mainboard_dir}/${tagged_version}/${timestamp}"
+	git commit -a -m "${mainboard_dir}/${tagged_version}/${timestamp}"
 	git push origin
 
 	# Results have been uploaded so it's pointless to keep the