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Currently if a pci dma mapping failure is detected a free'd
memblock address is returned rather than a NULL (that indicates
an error). Fix this by ensuring NULL is returned on this error case.
Addresses-Coverity: ("Use after free")
Fixes:
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| .. | ||
| vxge | ||
| Kconfig | ||
| Makefile | ||
| s2io-regs.h | ||
| s2io.c | ||
| s2io.h | ||