regmap: mmio: replace return 0 with break in switch statement

Variable min_stride is assigned a value that is never read, fix this by
replacing the return 0 with a break statement. This also makes the case
statement consistent with the other cases in the switch statement.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Link: https://lore.kernel.org/r/20220922080445.818020-1-colin.i.king@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/base/regmap/regmap-mmio.c

@@ -48,7 +48,7 @@ static int regmap_mmio_get_min_stride(size_t val_bits)
 	case 8:
 		/* The core treats 0 as 1 */
 		min_stride = 0;
-		return 0;
+		break;
 	case 16:
 		min_stride = 2;
 		break;