libnvdimm, pmem: fix kmap_atomic() leak in error path
When we enounter a bad block we need to kunmap_atomic() before returning. Cc: <stable@vger.kernel.org> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Reviewed-by: NVishal Verma <vishal.l.verma@intel.com> Signed-off-by: NDan Williams <dan.j.williams@intel.com>
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