haiku: Minor code convention cleanups.

Reference PR #14778.

src/video/haiku/SDL_bmodes.cc

@@ -243,13 +243,11 @@ bool HAIKU_GetDisplayModes(SDL_VideoDevice *_this, SDL_VideoDisplay *display)
     display_mode this_bmode;
     display_mode *bmodes;
     uint32 count, i;
-    bool r = false;
+    bool retval = false;
 
     // Get graphics-hardware supported modes
-    if (bscreen.GetModeList(&bmodes, &count) == B_OK)
-    {
-        if (bscreen.GetMode(&this_bmode) == B_OK)
-        {
+    if (bscreen.GetModeList(&bmodes, &count) == B_OK) {
+        if (bscreen.GetMode(&this_bmode) == B_OK) {
             for (i = 0; i < count; ++i) {
                 // FIXME: Apparently there are errors with colorspace changes
                 if (bmodes[i].space == this_bmode.space) {
@@ -257,12 +255,12 @@ bool HAIKU_GetDisplayModes(SDL_VideoDevice *_this, SDL_VideoDisplay *display)
                     SDL_AddFullscreenDisplayMode(display, &mode);
                 }
             }
-            r = true;
+            retval = true;
         }
         free(bmodes); // This should NOT be SDL_free()
     }
 
-    return r;
+    return retval;
 }