libnvdimm/label: Remove the dpa align check

There's no strict requirement why slot_valid() needs to check for page alignment
and it would seem to actively hurt cross-page-size compatibility. Let's
delete the check and rely on checksum validation.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Link: https://lore.kernel.org/r/20190905154603.10349-6-aneesh.kumar@linux.ibm.comSigned-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/nvdimm/label.c

@@ -353,11 +353,6 @@ static bool slot_valid(struct nvdimm_drvdata *ndd,
 	if (slot != __le32_to_cpu(nd_label->slot))
 		return false;
 
-	/* check that DPA allocations are page aligned */
-	if ((__le64_to_cpu(nd_label->dpa)
-				| __le64_to_cpu(nd_label->rawsize)) % SZ_4K)
-		return false;
-
 	/* check checksum */
 	if (namespace_label_has(ndd, checksum)) {
 		u64 sum, sum_save;