MFC: rev 1.153 Fix bug in malloc_uninit(): Releasing items from the mt_zone can not be done by a simple uma_zfree() call since mt_zone is allocated with the UMA_ZONE_MALLOC flag. Use uma_zfree_arg instead and supply the slab.
MFC: rev 1.153
Fix bug in malloc_uninit():
Releasing items from the mt_zone can not be done by a simple
uma_zfree() call since mt_zone is allocated with the UMA_ZONE_MALLOC
flag. Use uma_zfree_arg instead and supply the slab.

This bug caused panics in low memory situations on unloading kernel
modules containing MALLOC_DEFINE(..) statements.

Approved by:	re (scottl)

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