Mikolaj Golub 1d9db37c77 In g_gate_dumpconf() always check the result of g_gate_hold().
This fixes "Negative sc_ref" panic possible when sysctl_kern_geom_confxml()
is run simultaneously with destroying GATE device.

Reviewed by:	pjd
MFC after:	3 days
2012-08-07 18:50:33 +00:00
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