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>
diff --git a/drivers/media/video/cx88/cx88-input.c b/drivers/media/video/cx88/cx88-input.c
index 72b630a..c255646 100644
--- a/drivers/media/video/cx88/cx88-input.c
+++ b/drivers/media/video/cx88/cx88-input.c
@@ -89,7 +89,7 @@
 
 		auxgpio = cx_read(MO_GP1_IO);
 		/* Take out the parity part */
-		gpio+=(gpio & 0x7fd) + (auxgpio & 0xef);
+		gpio=(gpio & 0x7fd) + (auxgpio & 0xef);
 	} else
 		auxgpio = gpio;