Input: gamecon - mark expected switch fall-throughs

In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.

Addresses-Coverity-ID: 114761
Addresses-Coverity-ID: 114762
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/joystick/gamecon.c

@@ -654,6 +654,7 @@ static void gc_psx_report_one(struct gc_pad *pad, unsigned char psx_type,
 
 		input_report_key(dev, BTN_THUMBL, ~data[0] & 0x04);
 		input_report_key(dev, BTN_THUMBR, ~data[0] & 0x02);
+		/* fall through */
 
 	case GC_PSX_NEGCON:
 	case GC_PSX_ANALOG:
@@ -887,13 +888,15 @@ static int gc_setup_pad(struct gc *gc, int idx, int pad_type)
 	case GC_SNES:
 		for (i = 4; i < 8; i++)
 			__set_bit(gc_snes_btn[i], input_dev->keybit);
+		/* fall through */
 	case GC_NES:
 		for (i = 0; i < 4; i++)
 			__set_bit(gc_snes_btn[i], input_dev->keybit);
 		break;
 
 	case GC_MULTI2:
 		__set_bit(BTN_THUMB, input_dev->keybit);
+		/* fall through */
 	case GC_MULTI:
 		__set_bit(BTN_TRIGGER, input_dev->keybit);
 		break;