Revert "cxgb3: Check and handle the dma mapping errors"

Revert "cxgb3: Check and handle the dma mapping errors"

This reverts commit f83331bab149e29fa2c49cf102c0cd8c3f1ce9f9.

As the tests PPC64 (powernv platform) show, IOMMU pages are leaking
when transferring big amount of small packets (<=64 bytes),
"ping -f" and waiting for 15 seconds is the simplest way to confirm the bug.

Cc: Linus Torvalds <[email protected]>
Cc: Santosh Rastapur <[email protected]>
Cc: Jay Fenlason <[email protected]>
Cc: David S. Miller <[email protected]>
Cc: Divy Le ray <[email protected]>
Signed-off-by: Alexey Kardashevskiy <[email protected]>
Acked-by: Divy Le Ray <[email protected]>
Signed-off-by: David S. Miller <[email protected]>