vmalloc.c: fix double error checking
There is no need for double error checking. Signed-off-by: Figo.zhang <figo1802@gmail.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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