one successful return type. simplify build on vs2015
diff --git a/tinyxml2.cpp b/tinyxml2.cpp
index 36f37de..bfd8d1f 100755
--- a/tinyxml2.cpp
+++ b/tinyxml2.cpp
@@ -1286,7 +1286,7 @@
 XMLError XMLAttribute::QueryIntValue( int* value ) const

 {

     if ( XMLUtil::ToInt( Value(), value )) {

-        return XML_NO_ERROR;

+        return XML_SUCCESS;

     }

     return XML_WRONG_ATTRIBUTE_TYPE;

 }

@@ -1295,7 +1295,7 @@
 XMLError XMLAttribute::QueryUnsignedValue( unsigned int* value ) const

 {

     if ( XMLUtil::ToUnsigned( Value(), value )) {

-        return XML_NO_ERROR;

+        return XML_SUCCESS;

     }

     return XML_WRONG_ATTRIBUTE_TYPE;

 }

@@ -1304,7 +1304,7 @@
 XMLError XMLAttribute::QueryBoolValue( bool* value ) const

 {

     if ( XMLUtil::ToBool( Value(), value )) {

-        return XML_NO_ERROR;

+        return XML_SUCCESS;

     }

     return XML_WRONG_ATTRIBUTE_TYPE;

 }

@@ -1313,7 +1313,7 @@
 XMLError XMLAttribute::QueryFloatValue( float* value ) const

 {

     if ( XMLUtil::ToFloat( Value(), value )) {

-        return XML_NO_ERROR;

+        return XML_SUCCESS;

     }

     return XML_WRONG_ATTRIBUTE_TYPE;

 }

@@ -1322,7 +1322,7 @@
 XMLError XMLAttribute::QueryDoubleValue( double* value ) const

 {

     if ( XMLUtil::ToDouble( Value(), value )) {

-        return XML_NO_ERROR;

+        return XML_SUCCESS;

     }

     return XML_WRONG_ATTRIBUTE_TYPE;

 }

@@ -1771,7 +1771,7 @@
     XMLNode( 0 ),

     _writeBOM( false ),

     _processEntities( processEntities ),

-    _errorID( XML_NO_ERROR ),

+    _errorID(XML_SUCCESS),

     _whitespace( whitespace ),

     _errorStr1( 0 ),

     _errorStr2( 0 ),

@@ -1795,7 +1795,7 @@
 #ifdef DEBUG

     const bool hadError = Error();

 #endif

-    _errorID = XML_NO_ERROR;

+    _errorID = XML_SUCCESS;

     _errorStr1 = 0;

     _errorStr2 = 0;

 

@@ -2000,7 +2000,7 @@
 {

     // Clear any error from the last save, otherwise it will get reported

     // for *this* call.

-    SetError( XML_NO_ERROR, 0, 0 );

+	SetError(XML_SUCCESS, 0, 0);

     XMLPrinter stream( fp, compact );

     Print( &stream );

     return _errorID;