ivshmem: Delete duplicate debug message

Duplicated in commit ca0b7566.  Delete it.
Signed-off-by: NStefano Dong (董兴水) <opensource.dxs@aliyun.com>
Reviewed-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: NMarkus Armbruster <armbru@redhat.com>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

hw/misc/ivshmem.c

@@ -628,7 +628,6 @@ static void ivshmem_read(void *opaque, const uint8_t *buf, int size)
     s->msg_buffered_bytes = 0;
 
     fd = qemu_chr_fe_get_msgfd(s->server_chr);
-    IVSHMEM_DPRINTF("posn is %" PRId64 ", fd is %d\n", msg, fd);
 
     process_msg(s, msg, fd, &err);
     if (err) {