Fix a memory leak that showed up when we delete LUNs. The memory used for
the LUN was never freed.

ctl.c: Adjust ctl_alloc_lun() to make sure we don't clear the

		CTL_LUN_MALLOCED flag.

Reported by: Sreenivasa Honnur <shonnur@chelsio.com>
Sponsored by: Spectra Logic
MFC after: 3 days