Cleanup: silence warnings

```
warning: assignment discards ‘const’ qualifier from pointer target
warning: declaration of ‘co’ shadows a parameter
```

2 files changed, 12 insertions, 9 deletions

diff --git a/source/blender/gpu/intern/gpu_immediate_util.c b/source/blender/gpu/intern/gpu_immediate_util.c
index d848ea09a2a..aeed03080a3 100644
--- a/source/blender/gpu/intern/gpu_immediate_util.c
+++ b/source/blender/gpu/intern/gpu_immediate_util.c
@@ -441,16 +441,19 @@ void imm_draw_cube_corners_3d(uint pos,
 
   immBegin(GPU_PRIM_LINES, ARRAY_SIZE(cube_line_index) * 4);
   for (int i = 0; i < ARRAY_SIZE(cube_line_index); i++) {
-    float vec[3], co[3];
+    float vec[3], _co[3];
     sub_v3_v3v3(vec, coords[cube_line_index[i][1]], coords[cube_line_index[i][0]]);
     mul_v3_fl(vec, factor);
 
-    immVertex3fv(pos, coords[cube_line_index[i][0]]);
-    add_v3_v3v3(co, coords[cube_line_index[i][0]], vec);
-    immVertex3fv(pos, co);
-    sub_v3_v3v3(co, coords[cube_line_index[i][1]], vec);
-    immVertex3fv(pos, co);
-    immVertex3fv(pos, coords[cube_line_index[i][1]]);
+    copy_v3_v3(_co, coords[cube_line_index[i][0]]);
+    immVertex3fv(pos, _co);
+    add_v3_v3(_co, vec);
+    immVertex3fv(pos, _co);
+
+    copy_v3_v3(_co, coords[cube_line_index[i][1]]);
+    immVertex3fv(pos, _co);
+    sub_v3_v3(_co, vec);
+    immVertex3fv(pos, _co);
   }
   immEnd();
 }
diff --git a/source/blender/windowmanager/intern/wm_dragdrop.c b/source/blender/windowmanager/intern/wm_dragdrop.c
index f78bd528c5e..c60e47a3b0f 100644
--- a/source/blender/windowmanager/intern/wm_dragdrop.c
+++ b/source/blender/windowmanager/intern/wm_dragdrop.c
@@ -711,7 +711,7 @@ static void wm_drag_draw_tooltip(bContext *C, wmWindow *win, wmDrag *drag, const
   int iconsize = UI_DPI_ICON_SIZE;
   int padding = 4 * UI_DPI_FAC;
 
-  char *tooltip = NULL;
+  const char *tooltip = NULL;
   bool free_tooltip = false;
   if (UI_but_active_drop_name(C)) {
     tooltip = IFACE_("Paste name");
@@ -747,7 +747,7 @@ static void wm_drag_draw_tooltip(bContext *C, wmWindow *win, wmDrag *drag, const
 
     wm_drop_operator_draw(tooltip, x, y);
     if (free_tooltip) {
-      MEM_freeN(tooltip);
+      MEM_freeN((void *)tooltip);
     }
   }
 }