mm/mmap: add inline vma_next() for readability of mmap code
There are three places that the next vma is required which uses the same block of code. Replace the block with a function and add comments on what happens in the case where NULL is encountered. Signed-off-by: NLiam R. Howlett <Liam.Howlett@Oracle.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Reviewed-by: NAndrew Morton <akpm@linux-foundation.org> Link: http://lkml.kernel.org/r/20200818154707.2515169-1-Liam.Howlett@Oracle.comSigned-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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