[U-Boot] [PATCH v2] nios2: convert dma_alloc_coherent to use memalign

[Thomas Chou]

Hi Marek,

I look into the code again. I think it is the memalign() that might fail 
due to out of memory. While the ioremap() of nios2 won't fail. So I 
added a check on memalign() return. Please see v3.

Best regards,
Thomas