In procfs_readdir(), when the directory being read was a process directory,

the target process was being held locked during the uiomove() call.  If the
process calling readdir() was the same as the target process (for instance
'ls /proc/curproc/'), and uiomove() caused a page fault, the result would
be a proc lock recursion.  I have no idea how long this has been broken -
possibly ever since pfind() was changed to lock the process it returns.

Also replace the one and only call to procfs_findtextvp() with a direct
test of td->td_proc->p_textvp.

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