saner calling conventions for unlazy_child()

stable inclusion
from stable-v5.10.162
commit 36ec31201a3da85a112dd368be04aee05c713459
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7P7OH

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=36ec31201a3da85a112dd368be04aee05c713459



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[ Upstream commit ae66db45 ]

same as for the previous commit - instead of 0/-ECHILD make
it return true/false, rename to try_to_unlazy_child().

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>