maple_tree: remove a BUG_ON() in mas_alloc_nodes()

maple_tree: remove a BUG_ON() in mas_alloc_nodes()

Remove a BUG_ON() right before a WARN_ON() with the same condition.

Calling WARN_ON() and BUG_ON() here is definitely wrong.  Since the goal is
generally to remove BUG_ON() invocations from the kernel, keep only the
WARN_ON().

Link: https://lkml.kernel.org/r/20250213114453.1078318-1-ptesarik@suse.com
Fixes: 067311d33e65 ("maple_tree: separate ma_state node from status")
Signed-off-by: Petr Tesarik <ptesarik@suse.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>