[PATCH] freepgt: mpnt to vma cleanup

While dabbling here in mmap.c, clean up mysterious "mpnt"s to "vma"s.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>