clang-format: limit diff to 50 files to prevent exceding the maximum …

…travis output (4MB) (#5455)

util/travis/script.sh

@@ -13,11 +13,18 @@ function perform_lint() {
		files_to_lint="$(find src/ -name '*.cpp' -or -name '*.h' | egrep -v '^src/(gmp|lua|jsoncpp)/')"
	fi

	local errorcount=0
	local fail=0
	for f in ${files_to_lint}; do
		d=$(diff -u "$f" <(${CLANG_FORMAT} "$f") || true)
		if ! [ -z "$d" ]; then
			((errorcount++))
			printf "The file %s is not compliant with the coding style:\n%s\n" "$f" "$d"
			if [ ${errorcount} -gt 50 ]; then
				printf "Too many errors encountered previously, this diff is hidden.\n"
			else
				printf "%s\n" "$d"
			fi
			# Disable build failure at this moment as we need to have a complete MT source whitelist to check
			fail=0
		fi