Fix own error in changes to transform logic

Regression in 3c8e4e4180

source/blender/editors/transform/transform_orientations.c

@@ -1124,7 +1124,10 @@ void ED_getTransformOrientationMatrix(const bContext *C, float orientation_mat[3
 			break;
 		default:
 			BLI_assert(type == ORIENTATION_NONE);
-			unit_m3(orientation_mat);
 			break;
 	}
+
+	if (type == ORIENTATION_NONE) {
+		unit_m3(orientation_mat);
+	}
 }