PC-BSD/trueos 9771568sys/kern subr_vmem.c

Update the DIAGNOSTIC-only vmem_check_sanity() after r347949.

Cursor tags are special and shouldn't be subject to the existing checks.

Reported by:    kib, David Wolfskill
MFC with:       r347949
DeltaFile
+10-0sys/kern/subr_vmem.c
+10-01 files

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