fix errors in code

- BKE_mball_center_median(), didn't work.
- clip_refresh was removing handlers from wrong space.
- new_modifier, replace strcpy with BLI_strncpy

source/blender/blenkernel/intern/linestyle.c

@@ -183,7 +183,7 @@ static LineStyleModifier *new_modifier(int type, size_t size)
 
 	m = (LineStyleModifier *)MEM_callocN(size, "line style modifier");
 	m->type = type;
-	strcpy(m->name, modifier_name[type]);
+	BLI_strncpy(m->name, modifier_name[type], sizeof(m->name));
 	m->influence = 1.0f;
 	m->flags = LS_MODIFIER_ENABLED | LS_MODIFIER_EXPANDED;
 

source/blender/blenkernel/intern/mball.c

@@ -2446,6 +2446,7 @@ bool BKE_mball_center_median(MetaBall *mb, float r_cent[3])
 
 	for (ml = mb->elems.first; ml; ml = ml->next) {
 		add_v3_v3(r_cent, &ml->x);
+		total++;
 	}
 
 	if (total) {

source/blender/editors/space_clip/space_clip.c

@@ -1019,7 +1019,7 @@ static void clip_refresh(const bContext *C, ScrArea *sa)
 		if (ar_channels && !(ar_channels->flag & RGN_FLAG_HIDDEN)) {
 			ar_channels->flag |= RGN_FLAG_HIDDEN;
 			ar_channels->v2d.flag &= ~V2D_IS_INITIALISED;
-			WM_event_remove_handlers((bContext *)C, &ar_tools->handlers);
+			WM_event_remove_handlers((bContext *)C, &ar_channels->handlers);
 			view_changed = TRUE;
 		}
 		if (ar_channels && ar_channels->alignment != RGN_ALIGN_NONE) {