spi: potential memleak in spidev_ioctl

'ioc' should be deallocated if __copy_from_user fails (found by Coverity
- CID 1644).
Signed-off-by: NFlorin Malita <fmalita@gmail.com>
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/spi/spidev.c

@@ -364,6 +364,7 @@ spidev_ioctl(struct inode *inode, struct file *filp,
 			break;
 		}
 		if (__copy_from_user(ioc, (void __user *)arg, tmp)) {
+			kfree(ioc);
 			retval = -EFAULT;
 			break;
 		}