GTK: fixed segfaults when fullscreen would be called with no rom loaded

src/drivers/sdl/gui.cpp

@@ -938,21 +938,25 @@ void toggleSound(GtkWidget* check, gpointer data)
 
 void emuReset ()
 {
-	ResetNES();
+	if(isloaded)
+		ResetNES();
 }
 
 void emuPause ()
 {
-	FCEUI_SetEmulationPaused(1);
+	if(isloaded)
+		FCEUI_SetEmulationPaused(1);
 }
 void emuResume ()
 {
-	FCEUI_SetEmulationPaused(0);
+	if(isloaded)
+		FCEUI_SetEmulationPaused(0);
 }
 
 void enableFullscreen ()
 {
-	ToggleFS();
+	if(isloaded)
+		ToggleFS();
 }
 void recordMovie()
 {

src/drivers/sdl/sdl.cpp

@@ -59,8 +59,7 @@ bool turbo = false;
 
 int CloseGame(void);
 
-static int inited = 0;
-static int isloaded = 0;	
+static int inited = 0;	
 
 int eoptions=0;
 

src/drivers/sdl/sdl.h

@@ -7,6 +7,7 @@
 #include "input.h"
 
 static void DoFun(int frameskip);
+static int isloaded = 0;
 
 int LoadGame(const char *path);
 int CloseGame(void);