OpenZFS 9036 - zfs: duplicate 'const' declaration specifier

Authored by: Toomas Soome <tsoome@me.com>
Reviewed by: Yuri Pankov <yuripv@yuripv.net>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Approved by: Dan McDonald <danmcd@joyent.com>
Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>

OpenZFS-Issue: https://illumos.org/issues/9036
OpenZFS-Commit: openzfs/openzfs@f02c28e434
Issue #6900

module/zfs/vdev_indirect_mapping.c

@@ -136,8 +136,8 @@ vdev_indirect_mapping_size(vdev_indirect_mapping_t *vim)
 static int
 dva_mapping_overlap_compare(const void *v_key, const void *v_array_elem)
 {
-	const uint64_t * const key = v_key;
-	const vdev_indirect_mapping_entry_phys_t * const array_elem =
+	const uint64_t *key = v_key;
+	const vdev_indirect_mapping_entry_phys_t *array_elem =
 	    v_array_elem;
 	uint64_t src_offset = DVA_MAPPING_GET_SRC_OFFSET(array_elem);