staging: rts_pstor: dont cast void* from kmalloc()

 Casting (void *) value returned by kmalloc is useless
 as mentioned in Documentation/CodingStyle, Chap 14.

 The semantic patch that makes this output is available
 in scripts/coccinelle/api/alloc/drop_kmalloc_cast.cocci.

 More information about semantic patching is available at
 http://coccinelle.lip6.fr/Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/rts_pstor/sd.c

@@ -4139,7 +4139,7 @@ int sd_execute_read_data(struct scsi_cmnd *srb, struct rtsx_chip *chip)
 		cmd[3] = srb->cmnd[5];
 		cmd[4] = srb->cmnd[6];
 
-		buf = (u8 *)kmalloc(data_len, GFP_KERNEL);
+		buf = kmalloc(data_len, GFP_KERNEL);
 		if (buf == NULL) {
 			TRACE_RET(chip, TRANSPORT_ERROR);
 		}
@@ -4385,7 +4385,7 @@ int sd_execute_write_data(struct scsi_cmnd *srb, struct rtsx_chip *chip)
 		u16 i;
 		u8 *buf;
 
-		buf = (u8 *)kmalloc(data_len, GFP_KERNEL);
+		buf = kmalloc(data_len, GFP_KERNEL);
 		if (buf == NULL) {
 			TRACE_RET(chip, TRANSPORT_ERROR);
 		}