[gtk/324.c89: 1/2] gtk/gtkscrolledwindow.c: Declare variables at top-of-block

[Chun-wei Fan <fanchunwei src gnome org>]

commit ecd6b0b9a494a33a402cdddf16448727172f7f71
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Wed Dec 23 11:24:34 2020 +0800

    gtk/gtkscrolledwindow.c: Declare variables at top-of-block
    
    This way, the code can be built on C89-esque compilers.

 gtk/gtkscrolledwindow.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/gtk/gtkscrolledwindow.c b/gtk/gtkscrolledwindow.c
index 0f4193b14b..408c09265d 100644
--- a/gtk/gtkscrolledwindow.c
+++ b/gtk/gtkscrolledwindow.c
@@ -3754,10 +3754,11 @@ kinetic_scroll_stop_notify (GtkScrolledWindow *scrolled_window)
 static void
 gtk_scrolled_window_accumulate_velocity (GtkKineticScrolling **scrolling, double elapsed, double *velocity)
 {
+    double last_velocity;
+
     if (!*scrolling)
       return;
 
-    double last_velocity;
     gtk_kinetic_scrolling_tick (*scrolling, elapsed, NULL, &last_velocity);
     if (((*velocity >= 0) == (last_velocity >= 0)) &&
         (fabs (*velocity) >= fabs (last_velocity) * VELOCITY_ACCUMULATION_FLOOR))