Port xwidget.c to GCC 6 with --enable-gcc-warnings

* src/xwidget.c (x_draw_xwidget_glyph_string, xwidget_end_redisplay):
Adjust to pacify GCC.  Add a couple of FIXME comments, suggesting
possible bugs found by GCC.

1 files changed, 12 insertions, 2 deletions

diff --git a/src/xwidget.c b/src/xwidget.c
index 82449f7a215..9c505106144 100644
--- a/src/xwidget.c
+++ b/src/xwidget.c
@@ -565,12 +565,16 @@ x_draw_xwidget_glyph_string (struct glyph_string *s)
      xwidget on screen.  Moving and clipping is done here.  Also view
      initialization.  */
   struct xwidget *xww = s->xwidget;
-  struct xwidget_view *xv = xwidget_view_lookup (xww, s->w);
+  struct xwidget_view *xv;
   int clip_right;
   int clip_bottom;
   int clip_top;
   int clip_left;
 
+  /* FIXME: The result of this call is discarded.
+     What if the lookup fails?  */
+  xwidget_view_lookup (xww, s->w);
+
   int x = s->x;
   int y = s->y + (s->height / 2) - (xww->height / 2);
 
@@ -1145,7 +1149,13 @@ xwidget_end_redisplay (struct window *w, struct glyph_matrix *matrix)
                 {
                   /* The only call to xwidget_end_redisplay is in dispnew.
                      xwidget_end_redisplay (w->current_matrix);  */
-                  xwidget_touch (xwidget_view_lookup (glyph->u.xwidget, w));
+                  struct xwidget_view *xv
+                    = xwidget_view_lookup (glyph->u.xwidget, w);
+                  /* FIXME: Is it safe to assume xwidget_view_lookup
+                     always succeeds here?  If so, this comment can be removed.
+                     If not, the code probably needs fixing.  */
+                  eassume (xv);
+                  xwidget_touch (xv);
                 }
           }
     }