staging: qlge: unmap dma when lock failed

DMA not unmapped when lock failed, this patch fixed it.

Signed-off-by: Xiangyang Zhang <xyz.sun.ok@gmail.com>
Fixes: 4322c5be ("qlge: Expand coverage of hw lock for config register.")
Link: https://lore.kernel.org/r/20200517054638.10764-1-xyz.sun.ok@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>