joyGetPosEx() was using the wrong variable for specifying a device; this is

 corrected now. (thanks, Ondrej!)

Fixes Bugzilla libsdl-org#267.

Author: icculus

src/joystick/win32/SDL_mmjoystick.c

@@ -167,7 +167,7 @@ int SDL_SYS_JoystickInit(void)
 
 		joyinfo.dwSize = sizeof(joyinfo);
 		joyinfo.dwFlags = JOY_RETURNALL;
-		result = joyGetPosEx(SYS_JoystickID[i], &joyinfo);
+		result = joyGetPosEx(i, &joyinfo);
 		if ( result == JOYERR_NOERROR ) {
 			result = joyGetDevCaps(i, &joycaps, sizeof(joycaps));
 			if ( result == JOYERR_NOERROR ) {