[metrics] Simplify

src/hb-ot-metrics.cc

@@ -164,9 +164,14 @@ hb_ot_metrics_get_position (hb_font_t           *font,
   case HB_OT_METRICS_TAG_HORIZONTAL_CARET_RISE:
   case HB_OT_METRICS_TAG_HORIZONTAL_CARET_RUN:
   {
-    unsigned rise = face->table.hhea->caretSlopeRise;
-    unsigned upem = face->get_upem ();
-    unsigned mult = (font->slant && rise && rise < upem) ? hb_min (upem / rise, 256u) : 1u;
+    unsigned mult = 1u;
+
+    if (font->slant)
+    {
+      unsigned rise = face->table.hhea->caretSlopeRise;
+      unsigned upem = face->get_upem ();
+      mult = (rise && rise < upem) ? hb_min (upem / rise, 256u) : 1u;
+    }
 
     if (metrics_tag == HB_OT_METRICS_TAG_HORIZONTAL_CARET_RISE)
       return mult * GET_METRIC_Y (hhea, caretSlopeRise);