s4:torture: Make sure struct smb2_handle is initialized

s4:torture: Make sure struct smb2_handle is initialized

"Error: UNINIT (CWE-457):
samba-4.20.0rc2/source4/torture/smb2/lease.c:1223: var_decl: Declaring variable ""h2"" without initializer.
samba-4.20.0rc2/source4/torture/smb2/lease.c:1328: uninit_use_in_call: Using uninitialized value ""h2"" when calling ""smb2_util_close"".
 1326|    done:
 1327|   	smb2_util_close(tree, h);
 1328|-> 	smb2_util_close(tree, h2);
 1329|
 1330|   	smb2_util_unlink(tree, fname);"

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Martin Schwenke <mschwenke@ddn.com>