More warning fixes, switches and printfs, etc.

This time ones not reported by Visual Studio.

Core/HLE/sceKernelModule.cpp

@@ -903,7 +903,7 @@ u32 sceKernelLoadModuleByID(u32 id, u32 flags, u32 lmoptionPtr)
 {
 	u32 error;
 	u32 handle = __IoGetFileHandleFromId(id, error);
-	if (handle < 0) {
+	if (handle == -1) {
 		ERROR_LOG(HLE,"sceKernelLoadModuleByID(%08x, %08x, %08x): could not open file id",id,flags,lmoptionPtr);
 		return error;
 	}