Move variable declaration closer to where it's needed

tinyxml2.cpp

@@ -1861,7 +1861,6 @@ XMLError XMLDocument::SaveFile( FILE* fp, bool compact )
 
 XMLError XMLDocument::Parse( const char* p, size_t len )
 {
-	const char* start = p;
     Clear();
 
     if ( len == 0 || !p || !*p ) {
@@ -1875,6 +1874,7 @@ XMLError XMLDocument::Parse( const char* p, size_t len )
     memcpy( _charBuffer, p, len );
     _charBuffer[len] = 0;
 
+    const char* start = p;
     p = XMLUtil::SkipWhiteSpace( p );
     p = XMLUtil::ReadBOM( p, &_writeBOM );
     if ( !p || !*p ) {