Fixing clang warning.

Warning was: "implicit conversion from enumeration type 'VPX_SCALING_MODE'
(aka 'enum vpx_scaling_mode_1d') to different enumeration type
'VPX_SCALING'".

Change-Id: I45689e439a8775bc1e7534d0ea1ff7c729f2c7f5

vp9/vp9_cx_iface.c

diff --git a/vp9/vp9_cx_iface.c b/vp9/vp9_cx_iface.c
index 0f12d88..4d39670 100644
--- a/vp9/vp9_cx_iface.c
+++ b/vp9/vp9_cx_iface.c
@@ -995,8 +995,9 @@
   if (data) {
     int res;
     vpx_scaling_mode_t scalemode = *(vpx_scaling_mode_t *)data;
-    res = vp9_set_internal_size(ctx->cpi, scalemode.h_scaling_mode,
-                                scalemode.v_scaling_mode);
+    res = vp9_set_internal_size(ctx->cpi,
+                                (VPX_SCALING)scalemode.h_scaling_mode,
+                                (VPX_SCALING)scalemode.v_scaling_mode);
 
     if (!res) {
       return VPX_CODEC_OK;