V4L/DVB(12993b): gl860: Prevent a potential risk of zeroing a floating pointer

drivers/media/video/gspca/gl860/gl860.c: In function ‘gl860_build_control_table’:
drivers/media/video/gspca/gl860/gl860.c:119: warning: ‘sd_ctrls’ may be used uninitialized in this function
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/gl860/gl860.c

@@ -129,6 +129,8 @@ static int gl860_build_control_table(struct gspca_dev *gspca_dev)
 		sd_ctrls = sd_ctrls_ov2640;
 	else if (_OV9655_)
 		sd_ctrls = sd_ctrls_ov9655;
+	else
+		return 0;
 
 	memset(sd_ctrls, 0, GL860_NCTRLS * sizeof(struct ctrl));