rtc: ds1307: fix Wvoid-pointer-to-enum-cast warning

'type' is an enum, thus cast of pointer on 64-bit compile test with W=1
causes:

  rtc-ds1307.c:1747:18: error: cast to smaller integer type 'enum ds_type' from 'const void *' [-Werror,-Wvoid-pointer-to-enum-cast]

Signed-off-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexandre Belloni <[email protected]>

Author: krzk

drivers/rtc/rtc-ds1307.c

@@ -1744,7 +1744,7 @@ static int ds1307_probe(struct i2c_client *client)
 
 	match = device_get_match_data(&client->dev);
 	if (match) {
-		ds1307->type = (enum ds_type)match;
+		ds1307->type = (uintptr_t)match;
 		chip = &chips[ds1307->type];
 	} else if (id) {
 		chip = &chips[id->driver_data];