mmc: dw_mmc: Fix null dma_ops access when use_dma is false
host->dma_ops is not valid if host->usa dma is 0 so protect host->dma_ops reference in dw_mci_resume Signed-off-by: Jonathan Kliegman <kliegs@chromium.org> Acked-by: Jaehoon Chung <jh80.chung@samsung.com> Acked-by: Will Newton <will.newton@imgtec.com> Signed-off-by: Chris Ball <cjb@laptop.org>
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