Fix M_RTABLE memory leak from r274118 (11/2014).
Replace free(M_RTABLE) with rn_detachhead() to match rn_inithead().
This would trigger when reloading NFS exports and was similar to
problems with pf reload [1].
PR: 194078 [1]
Sponsored by: EMC / Isilon Storage Division
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head/sys/kern/vfs_export.c