Cleanup: remove redundant/outdated comments

source/blender/blenkernel/intern/object.c

@@ -3212,12 +3212,11 @@ void BKE_object_to_mat3(Object *ob, float r_mat[3][3]) /* no parent */
 {
   float smat[3][3];
   float rmat[3][3];
-  /*float q1[4];*/
 
-  /* scale */
+  /* Scale. */
   BKE_object_scale_to_mat3(ob, smat);
 
-  /* rot */
+  /* Rotation. */
   BKE_object_rot_to_mat3(ob, rmat, true);
   mul_m3_m3m3(r_mat, rmat, smat);
 }

source/blender/editors/physics/dynamicpaint_ops.c

@@ -454,7 +454,7 @@ static void dpaint_bake_startjob(void *customdata, short *stop, short *do_update
   job->start = PIL_check_seconds_timer();
   job->success = 1;
 
-  G.is_break = false; /* reset BKE_blender_test_break*/
+  G.is_break = false;
 
   /* XXX annoying hack: needed to prevent data corruption when changing
    * scene frame in separate threads

source/blender/modifiers/intern/MOD_screw.c

@@ -341,7 +341,6 @@ static Mesh *modifyMesh(ModifierData *md, const ModifierEvalContext *ctx, Mesh *
 #endif
   }
   else {
-    /* exis char is used by i_rotate*/
     axis_char = (char)(axis_char + ltmd->axis); /* 'X' + axis */
 
     /* useful to be able to use the axis vec in some cases still */