mm/memory: fix a typo in comment "attampt"->"attempt"

There is a comment in typo, fix it.

Signed-off-by: Ethon Paul <ethp@qq.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20200411004043.14686-1-ethp@qq.com


Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>