mm/vmalloc: print a warning message first on failure

When a memory allocation for array of pages are not succeed emit a warning
message as a first step and then perform the further cleanup.

The reason it should be done in a right order is the clean up function
which is free_vm_area() can potentially also follow its error paths what
can lead to confusion what was broken first.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Uladzislau Rezki (Sony) <[email protected]>
Cc: Hillf Danton <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Nicholas Piggin <[email protected]>
Cc: Oleksiy Avramchenko <[email protected]>
Cc: Steven Rostedt <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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