staging: rts5139: use kzalloc() to close an info leak

If we don't fill the whole buffer then there is information leaked to
the user.

Signed-off-by: Dan Carpenter <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/rts5139/rts51x_fop.c

···
 
 	case 1:
 		/* Read from card */
-		buf = kmalloc(cmnd->buf_len, GFP_KERNEL);
+		buf = kzalloc(cmnd->buf_len, GFP_KERNEL);
 		if (!buf)
 			TRACE_RET(chip, STATUS_NOMEM);