Refactor TakeGameScreenshot a bit.

Core/HLE/sceKernelModule.cpp

@@ -483,7 +483,7 @@ void PSPModule::GetLongInfo(char *ptr, int bufSize) const {
 	StringWriter w(ptr, bufSize);
 	w.F("%s: Version %d.%d. %d segments", nm.name, nm.version[1], nm.version[0], nm.nsegment).endl();
 	w.F("Memory block: %08x (%08x/%d bytes)", memoryBlockAddr, memoryBlockSize, memoryBlockSize).endl();
-	for (int i = 0; i < nm.nsegment; i++) {
+	for (int i = 0; i < (int)nm.nsegment; i++) {
 		w.F("  %08x (%08x bytes)\n", nm.segmentaddr[i], nm.segmentsize[i]);
 	}
 	w.F("Text: %08x (%08x bytes)\n", nm.text_addr, nm.text_size);