Tools/MeshExtractor: Removed some redundant code

src/tools/mesh_extractor/MPQ.cpp

@@ -103,8 +103,7 @@ void MPQFile::seekRelative(int offset)
 
 void MPQFile::close()
 {
-    if (buffer)
-        delete[] buffer;
+    delete[] buffer;
     buffer = 0;
     eof = true;
 }

src/tools/mesh_extractor/WorldModelRoot.cpp

@@ -14,8 +14,7 @@ WorldModelRoot::WorldModelRoot( std::string path )
 
 WorldModelRoot::~WorldModelRoot()
 {
-    if (Data)
-        delete Data;
+    delete Data;
 }
 
 void WorldModelRoot::ReadGroups()