Update to match mxio changes.

Change-Id: I52a8a5885af5fe5eaefc1268c7cf46465fd89742
diff --git a/linenoise.c b/linenoise.c
index 7eb39a1..503355b 100644
--- a/linenoise.c
+++ b/linenoise.c
@@ -337,7 +337,7 @@
 static int getColumns(int ifd, int ofd) {
 #ifdef __Fuchsia__
     ioctl_console_dimensions_t dims;
-    ssize_t r = mxio_ioctl(0, CONSOLE_OP_GET_DIMENSIONS, NULL, 0, &dims,
+    ssize_t r = mxio_ioctl(0, IOCTL_CONSOLE_GET_DIMENSIONS, NULL, 0, &dims,
         sizeof(dims));
     if (r == sizeof(dims)) {
 #else