media: em28xx: fix two smatch warnings

Use sizeof instead of ARRAY_SIZE to fix this smatch warning:

drivers/media/usb/em28xx/em28xx-i2c.c:952 em28xx_do_i2c_scan() warn: calling memset(x, y, ARRAY_SIZE());

Do the same for the em28xx_hash_mem() call in the same function.
smatch didn't pick that up, but there too it should use sizeof instead
of ARRAY_SIZE.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/usb/em28xx/em28xx-i2c.c

@@ -949,7 +949,7 @@ void em28xx_do_i2c_scan(struct em28xx *dev, unsigned int bus)
 	unsigned char buf;
 	int i, rc;
 
-	memset(i2c_devicelist, 0, ARRAY_SIZE(i2c_devicelist));
+	memset(i2c_devicelist, 0, sizeof(i2c_devicelist));
 
 	for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
 		dev->i2c_client[bus].addr = i;
@@ -964,7 +964,7 @@ void em28xx_do_i2c_scan(struct em28xx *dev, unsigned int bus)
 
 	if (bus == dev->def_i2c_bus)
 		dev->i2c_hash = em28xx_hash_mem(i2c_devicelist,
-						ARRAY_SIZE(i2c_devicelist), 32);
+						sizeof(i2c_devicelist), 32);
 }
 
 /*