[SCSI] megaraid: Make megaraid_ioctl() check copy_to_user() return value

Check copy_to_user() return value in drivers/scsi/megaraid.c::megadev_ioctl()
This gets rid of this little warning:
  drivers/scsi/megaraid.c:3661: warning: ignoring return value of 'copy_to_user', declared with attribute warn_unused_result

Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Acked-by: "Ju, Seokmann" <Seokmann.Ju@lsil.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/megaraid.c

@@ -3656,8 +3656,9 @@ megadev_ioctl(struct inode *inode, struct file *filep, unsigned int cmd,
 			 * Send the request sense data also, irrespective of
 			 * whether the user has asked for it or not.
 			 */
-			copy_to_user(upthru->reqsensearea,
-					pthru->reqsensearea, 14);
+			if (copy_to_user(upthru->reqsensearea,
+					pthru->reqsensearea, 14))
+				rval = -EFAULT;
 
 freemem_and_return:
 			if( pthru->dataxferlen ) {