use calloc to hopefully not read random stuff

src/emu.c

@@ -226,7 +226,7 @@ void startEmulator(Emulator* emu) {
 }
 
 Emulator* initEmulator(uint32_t memorySize) {
-    Emulator* newEmu = malloc(sizeof(Emulator));
+    Emulator* newEmu = calloc(1, sizeof(Emulator));
     if (!newEmu)
         return NULL;
 
@@ -256,4 +256,4 @@ void freeEmulator(Emulator* emu) {
 void installDevice(Emulator* emu, Device* device, uint8_t deviceNumber) {
     assert(deviceNumber < MAX_DEVICES);
     emu->devices[deviceNumber] = device;
-}
+}