Staging: mt29f_spinand: Remove space after a cast

Modify retval to reflect removal of space during cast operation.
Checkpatch found this issue.

CHECK: No space is necessary after a cast
Signed-off-by: NEva Rachel Retuya <eraretuya@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt29f_spinand/mt29f_spinand.c

@@ -594,7 +594,7 @@ static int spinand_erase_block(struct spi_device *spi_nand, u16 block_id)
 		if (retval < 0) {
 			dev_err(&spi_nand->dev,
 					"error %d reading status register\n",
-					(int) retval);
+					(int)retval);
 			return retval;
 		}