[AFS]: Fix memory leak in SRXAFSCB_GetCapabilities

The interface array is not freed on exit.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

fs/afs/cmservice.c

@@ -443,6 +443,7 @@ static void SRXAFSCB_GetCapabilities(struct work_struct *work)
 			reply.ia.netmask[loop] = ifs[loop].netmask.s_addr;
 			reply.ia.mtu[loop] = htonl(ifs[loop].mtu);
 		}
+		kfree(ifs);
 	}
 
 	reply.cap.capcount = htonl(1);