fix unittest warnings + remove trailing spaces

makefile

@@ -47,9 +47,9 @@ trail:
 	sh third_party/remote_trailing_whitespaces.sh
 
 format:
-	find test ixwebsocket ws -name '*.cpp' -o -name '*.h' -exec clang-format -i {} \;
+	clang-format -i `find test ixwebsocket ws -name '*.cpp' -o -name '*.h'`
 
-# That target is used to start a node server, but isn't required as we have 
+# That target is used to start a node server, but isn't required as we have
 # a builtin C++ server started in the unittest now
 test_server:
 	(cd test && npm i ws && node broadcast-server.js)