These are Alexander Kabaev's VFSops fixes (see the thread 'Found: module

loading breakage').  The patch fixes serious issues with the VFS
operations vector array which results in a crash when a filesystem module
adding a new VOP is loaded into the kernel.  Basically what was happening
before was that the old operations vector was being freed and a new one
allocated.  The original MALLOC code tended to reuse the same address
for the case and so the bug did not rear its ugly head until the new memory
subsystem was emplaced.

This patch replaces the temporary workaround Dave O'Brien comitted in 1.58.

The patch is clean enough that I intend to MFC it to stable at some point.

Submitted by:	Alexander Kabaev <ak03@gte.com>
MFC after:	1 week

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