vsock: use sizeof(struct sockaddr_storage) instead of magic value

Previous commit 230b183921ec ("net: Use standard structures for generic
socket address structures.") use 'struct sockaddr_storage address;'
to replace 'char address[MAX_SOCK_ADDR];'.

The macro MAX_SOCK_ADDR is removed by commit 01893c82b4e6 ("net: Remove
MAX_SOCK_ADDR constant").

The comment in vsock_getname() is outdated, use sizeof(struct
sockaddr_storage) instead of magic value 128.

Signed-off-by: Wang Liang <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

net/vmw_vsock/af_vsock.c

···
 		vm_addr = &vsk->local_addr;
 	}
 
-	/* sys_getsockname() and sys_getpeername() pass us a
-	 * MAX_SOCK_ADDR-sized buffer and don't set addr_len.  Unfortunately
-	 * that macro is defined in socket.c instead of .h, so we hardcode its
-	 * value here.
-	 */
-	BUILD_BUG_ON(sizeof(*vm_addr) > 128);
+	BUILD_BUG_ON(sizeof(*vm_addr) > sizeof(struct sockaddr_storage));
 	memcpy(addr, vm_addr, sizeof(*vm_addr));
 	err = sizeof(*vm_addr);