staging: r8188eu: efuse_utilized is never read

The efuse_utilized variable in function efuse_phymap_to_logical is
written to but never read. Remove it.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220709171000.180481-14-martin@kaiser.cx


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