Fix a bug in a MatSparse ctor ; dimensions inconsistency against eigen internal matrix.

src/faust_linear_operator/CPU/faust_MatSparse.hpp

@@ -362,6 +362,7 @@ Faust::MatSparse<FPP,Cpu>::MatSparse(const unsigned int* rowidx, const unsigned
 	mat.setFromTriplets(tripletList.begin(), tripletList.end());
 	mat.makeCompressed();
 	this->nnz = mat.nonZeros();
+	this->update_dim();
 }
 
 template<typename FPP>