removed compiler warnings

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@2223 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/media/TList.h

@@ -36,6 +36,7 @@ public:
 	 		items[i] = new value;
 	 		*items[i] = *other.items[i];
 	 	}
+	 	return *this;
 	}
 		
 	bool Insert(const value &v)

headers/private/media/TMap.h

@@ -38,6 +38,7 @@ public:
 	 		items[i]->k = other.items[i]->k;
 	 		items[i]->v = other.items[i]->v;
 	 	}
+	 	return *this;
 	}
 		
 	bool Insert(const key &k, const value &v)