[Bug 265145] bectl: fix potential resource leak in bectl_locate_jail(), print_snapshots() and bectl_cmd_list()

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265145

            Bug ID: 265145
           Summary: bectl: fix potential resource leak in
                    bectl_locate_jail(),  print_snapshots() and
                    bectl_cmd_list()
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: niejianglei2021@163.com

bectl_locate_jail(), print_snapshots() and bectl_cmd_list() allocate
resource with be_prop_list_alloc(). When some error occrus, relevant
resource should be released with be_prop_list_free(). Forgetting the
release operation will cause resource leak.

This patch fix the resource leak with adding the missing
be_prop_list_free() on the error path.

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