test_maple_tree: test exhausted upper limit of mtree_alloc_cyclic()

When the upper bound of the search is exhausted, the maple state may be
returned in an error state of -EBUSY.  This means maple state needs to be
reset before the second search in mas_alloc_cylic() to ensure the search
happens.  This test ensures the issue is not recreated.

Link: https://lkml.kernel.org/r/20241216190113.1226145-3-Liam.Howlett@oracle.com


Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Reviewed-by: Yang Erkun <yangerkun@huawei.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Chuck Lever <chuck.lever@oracle.com> says:
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>