Code cleanup: comments

source/blender/blenkernel/intern/image.c

@@ -2023,7 +2023,7 @@ int BKE_imbuf_write(ImBuf *ibuf, const char *name, ImageFormatData *imf)
 	return(ok);
 }
 
-/* same as BKE_imbuf_write() but crappy workaround not to perminantly modify
+/* same as BKE_imbuf_write() but crappy workaround not to permanently modify
  * _some_, values in the imbuf */
 int BKE_imbuf_write_as(ImBuf *ibuf, const char *name, ImageFormatData *imf,
                        const bool save_copy)

source/blender/editors/interface/interface_handlers.c

@@ -7044,7 +7044,7 @@ void ui_button_activate_do(bContext *C, ARegion *ar, uiBut *but)
 
 void ui_button_execute_begin(struct bContext *UNUSED(C), struct ARegion *ar, uiBut *but, void **active_back)
 {
-	/* note: ideally we would not have to change 'but->active' howevwer
+	/* note: ideally we would not have to change 'but->active' however
 	 * some functions we call don't use data (as they should be doing) */
 	uiHandleButtonData *data;
 	*active_back = but->active;

source/blender/editors/space_view3d/drawobject.c

@@ -791,7 +791,6 @@ void view3d_cached_text_draw_add(const float co[3],
                                  const unsigned char col[4])
 {
 	int alloc_len = str_len + 1;
-	/* TODO, replace with more efficient malloc, perhaps memarena per draw? */
 	ViewCachedString *vos;
 
 	BLI_assert(str_len == strlen(str));

source/blender/imbuf/intern/colormanagement.c

@@ -1895,7 +1895,7 @@ ImBuf *IMB_colormanagement_imbuf_for_write(ImBuf *ibuf, bool save_as_render, boo
 	 * so much useful to just ignore alpha -- it leads to bad
 	 * artifacts especially when saving byte images.
 	 *
-	 * What we do here is we're overing our image on top of
+	 * What we do here is we're overlaying our image on top of
 	 * background color (which is currently black).
 	 *
 	 * This is quite much the same as what Gimp does and it

source/blender/windowmanager/intern/wm_event_system.c

@@ -3349,7 +3349,7 @@ void WM_set_locked_interface(wmWindowManager *wm, bool lock)
 	 *
 	 * TODO(sergey): Make it different locked states, so different jobs
 	 *               could lock different areas of blender and allow
-	 *               interation with others?
+	 *               interaction with others?
 	 */
 	BKE_spacedata_draw_locks(lock);
 }