etraxfs_eth: drop bogus cpu_unregister_io_memory()

Leftover call to cpu_unregister_io_memory() can segfault on cleanup.  Remove.

Signed-off-by: Avi Kivity <avi@redhat.com>

hw/etraxfs_eth.c

@@ -323,7 +323,6 @@ struct fs_eth
 	MemoryRegion mmio;
 	NICState *nic;
 	NICConf conf;
-	int ethregs;
 
 	/* Two addrs in the filter.  */
 	uint8_t macaddr[2][6];
@@ -571,8 +570,6 @@ static void eth_cleanup(VLANClientState *nc)
 {
 	struct fs_eth *eth = DO_UPCAST(NICState, nc, nc)->opaque;
 
-        cpu_unregister_io_memory(eth->ethregs);
-
 	/* Disconnect the client.  */
 	eth->dma_out->client.push = NULL;
 	eth->dma_out->client.opaque = NULL;