Pre-commit: Don't force whitespace checks everywhere.

Move the whitespace check (git diff-index --check --cached) inside the
CHECK_FILES loop, otherwise editing SVGs with Inkscape will be much less
convenient.

Change-Id: I2b9e3575d54091572caa89e3e317e5e121984010
Reviewed-on: https://code.wireshark.org/review/25144


Reviewed-by: Gerald Combs <gerald@wireshark.org>
Petri-Dish: Gerald Combs <gerald@wireshark.org>
Tested-by: Petri Dish Buildbot
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>

tools/pre-commit

@@ -90,6 +90,9 @@ for FILE in $CHECK_FILES; do
     #Check if checkfiltername is good
     ./tools/checkfiltername.pl $FILE    || exit_status=1
 
+    # If there are whitespace errors, print the offending file names and fail. (from git pre-commit.sample)
+    git diff-index --check --cached ${COMMIT_ID} $FILE || exit_status=1
+
 done
 
 if [ "x$DIAMETER_FILES" != x ]
@@ -97,9 +100,6 @@ then
     ./tools/validate-diameter-xml.sh > /dev/null || exit_status=1
 fi
 
-# If there are whitespace errors, print the offending file names and fail. (from git pre-commit.sample)
-git diff-index --check --cached ${COMMIT_ID}    || exit_status=1
-
 exit $exit_status
 
 #