From 4d4681f6b994baf93dff0e4f59ab4fe38b49ef13 Mon Sep 17 00:00:00 2001
From: Jeff Garzik <jeff@garzik.org>
Date: Tue, 21 Mar 2006 21:31:22 -0500
Subject: [PATCH] [libata] fix oops on non-DMA bmdma hardware

Alan noted: "bmdma may be zero but the bmdma_irq_clear function gets
called even in this case during pure PIO operation. Check we have a
bmdma before we use it."

I fixed this by adding a check for zero.  While was I there, I fixed the
non-standard indentation of the small function's code.

Signed-off-by: Jeff Garzik <jeff@garzik.org>
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