__nd_alloc_stack(): make it return bool

... and adjust the caller (reserve_stack()).  Rename to nd_alloc_stack(),
while we are at it.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-03-03 11:43:55 -05:00
commit 60ef60c7d7