Fix sometimes-spurious warning about changed config.h
After backing up and restoring config.h, `git diff-files` may report
it as potentially-changed because it isn't sure whether the index is
up to date. Use `git diff` instead: it actually reads the file.
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 56e715a..01e7a5f 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -381,7 +381,7 @@
exit 1
fi
- if ! git diff-files --quiet include/mbedtls/config.h; then
+ if ! git diff --quiet include/mbedtls/config.h; then
err_msg "Warning - the configuration file 'include/mbedtls/config.h' has been edited. "
echo "You can either delete or preserve your work, or force the test by rerunning the"
echo "script as: $0 --force"