Spatial SVC crash fix

Fixes a spatial_svc breakage introduced in
https://chromium-review.googlesource.com/#/c/305228/3.

Change-Id: I7f2cecbdca980addb85d5e58b58b5454f4730ada

vp9/encoder/vp9_encodeframe.c

diff --git a/vp9/encoder/vp9_encodeframe.c b/vp9/encoder/vp9_encodeframe.c
index f9c28f6..edccc4d 100644
--- a/vp9/encoder/vp9_encodeframe.c
+++ b/vp9/encoder/vp9_encodeframe.c
@@ -2432,8 +2432,15 @@
 
   if (cpi->sf.use_square_partition_only &&
       bsize > cpi->sf.use_square_only_threshold) {
+    if (cpi->use_svc) {
+      if (!vp9_active_h_edge(cpi, mi_row, mi_step) || x->e_mbd.lossless)
+        partition_horz_allowed &= force_horz_split;
+      if (!vp9_active_v_edge(cpi, mi_row, mi_step) || x->e_mbd.lossless)
+        partition_vert_allowed &= force_vert_split;
+    } else {
       partition_horz_allowed &= force_horz_split;
       partition_vert_allowed &= force_vert_split;
+    }
   }
 
   save_context(x, mi_row, mi_col, a, l, sa, sl, bsize);