mm/vmalloc: replace BUG_ON with a simple if statement

As per the coding standards, in the event of an abnormal condition that
should not occur under normal circumstances, the kernel should attempt
recovery and proceed with execution, rather than halting the machine.

Specifically, in the alloc_vmap_area() function, use a simple if()
instead of using BUG_ON() halting the machine.

Link: https://lkml.kernel.org/r/20230201115142.GA7772@min-iamroot
Co-developed-by: Gwan-gyeong Mun <[email protected]>
Signed-off-by: Gwan-gyeong Mun <[email protected]>
Co-developed-by: Jeungwoo Yoo <[email protected]>
Signed-off-by: Jeungwoo Yoo <[email protected]>
Co-developed-by: Sangyun Kim <[email protected]>
Signed-off-by: Sangyun Kim <[email protected]>
Signed-off-by: Hyunmin Lee <[email protected]>
Reviewed-by: Christophe Leroy <[email protected]>
Reviewed-by: Hyeonggon Yoo <[email protected]>
Reviewed-by: Mike Rapoport (IBM) <[email protected]>
Reviewed-by: Uladzislau Rezki (Sony) <[email protected]>
Cc: Hyeonggon Yoo <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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