V4L/DVB (4313): Bugfix for keycode calculation on NPG remotes

Fix keycode calculations (all codes for this remote were wrong due to a
lost + sign)
Signed-off-by: Ricardo Cerqueira <v4l@cerqueira.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/cx88/cx88-input.c

@@ -89,7 +89,7 @@ static void cx88_ir_handle_key(struct cx88_IR *ir)
 
 		auxgpio = cx_read(MO_GP1_IO);
 		/* Take out the parity part */
-		gpio+=(gpio & 0x7fd) + (auxgpio & 0xef);
+		gpio=(gpio & 0x7fd) + (auxgpio & 0xef);
 	} else
 		auxgpio = gpio;