fix warning

Eigen/src/Core/Part.h

diff --git a/Eigen/src/Core/Part.h b/Eigen/src/Core/Part.h
index 9319335..aed7712 100644
--- a/Eigen/src/Core/Part.h
+++ b/Eigen/src/Core/Part.h
@@ -88,7 +88,7 @@
 
     inline Scalar coeff(int row, int col) const
     {
-      if( (Flags & LowerTriangularBit) && (col>row) || (Flags & UpperTriangularBit) && (row>col) )
+      if( ((Flags & LowerTriangularBit) && (col>row)) || ((Flags & UpperTriangularBit) && (row>col)) )
         return (Flags & SelfAdjointBit) ? ei_conj(m_matrix.coeff(col, row)) : (Scalar)0;
       if(Flags & UnitDiagBit)
         return col==row ? (Scalar)1 : m_matrix.coeff(row, col);