This patch contains the following possible cleanups:
- make some needlessly global code static
- ide-dma.c: remove the unneeded EXPORT_SYMBOL(__ide_dma_test_irq)

slightly changed by me (bart)
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>