Fix out-of-bounds memory access in CvodesIntegrator::getErrorInfo

Out-of-bounds memory was being accessed in cases where the system had fewer
state variables than the specified maximum number of error estimates to display.

src/numerics/CVodesIntegrator.cpp

@@ -465,6 +465,7 @@ string CVodesIntegrator::getErrorInfo(int N)
     N_VDestroy(errs);
     N_VDestroy(errw);
 
+    N = std::min(N, static_cast<int>(m_neq));
     sort(weightedErrors.begin(), weightedErrors.end());
     stringstream s;
     for (int i=0; i<N; i++) {