Fix error in last commit.

treedata could have a non-initialized tree in case of edge_snapping, leading to segfault.

Spotted by @mano-wii, thanks.

source/blender/editors/transform/transform_snap.c

@@ -1539,7 +1539,7 @@ static bool snapDerivedMesh(
 		float ray_start_local[3], ray_normal_local[3];
 		float local_scale, local_depth, len_diff;
 
-		BVHTreeFromMesh treedata;
+		BVHTreeFromMesh treedata = {0};
 
 		invert_m4_m4(imat, obmat);
 		transpose_m3_m4(timat, imat);