linux/libshare: smb: don't leak share name in smb_disable_share_one()
Fixes: 645fb9cc21 "Implemented sharing datasets via SMB using libshare"
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12015