LINT fix & check all files with clang-format

Seems the diff mode doesn't work well, PR are detected as working whereas in master it's shown it's problematic (and really problematic). Use same check everywhere

src/script/lua_api/l_client.cpp

@@ -88,7 +88,7 @@ int ModApiClient::l_display_chat_message(lua_State *L)
 // send_chat_message(message)
 int ModApiClient::l_send_chat_message(lua_State *L)
 {
-	if (!lua_isstring(L,1))
+	if (!lua_isstring(L, 1))
 		return 0;
 	std::string message = luaL_checkstring(L, 1);
 	getClient(L)->sendChatMessage(utf8_to_wide(message));

util/travis/lint.sh

@@ -9,13 +9,7 @@ function perform_lint() {
 	echo "LINT: Using binary $CLANG_FORMAT"
 	CLANG_FORMAT_WHITELIST="util/travis/clang-format-whitelist.txt"
 
-	if [ "$TRAVIS_EVENT_TYPE" = "pull_request" ]; then
-		# Get list of every file modified in this pull request
-		files_to_lint="$(git diff --name-only --diff-filter=ACMRTUXB $TRAVIS_COMMIT_RANGE | grep '^src/[^.]*[.]\(cpp\|h\)$' | true)"
-	else
-		# Check everything for branch pushes
-		files_to_lint="$(find src/ -name '*.cpp' -or -name '*.h')"
-	fi
+	files_to_lint="$(find src/ -name '*.cpp' -or -name '*.h')"
 
 	local errorcount=0
 	local fail=0