Fixed the unary minus bug reported by elvman.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@922 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/COBJMeshFileLoader.cpp

@@ -714,7 +714,7 @@ bool COBJMeshFileLoader::retrieveVertexIndices(c8* pVertexData, s32* pIdx, const
 			// if no number was found index will become 0 and later on -1 by decrement
 			if (word[0]=='-')
 			{
-				pIdx[idxType] = -core::strtol10(word+1,0);
+				pIdx[idxType] = -1*core::strtol10(word+1,0);
 				switch (idxType)
 				{
 					case 0: