[media] smiapp: Initialise rval in smiapp_read_nvm()

rval was not properly initialised in smiapp_read_nvm(). Do that.
Signed-off-by: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/smiapp/smiapp-core.c

@@ -873,7 +873,7 @@ static int smiapp_read_nvm(struct smiapp_sensor *sensor,
 			   unsigned char *nvm)
 {
 	u32 i, s, p, np, v;
-	int rval, rval2;
+	int rval = 0, rval2;
 
 	np = sensor->nvm_size / SMIAPP_NVM_PAGE_SIZE;
 	for (p = 0; p < np; p++) {