Update MarketIO.h

unsupported/Eigen/src/SparseExtra/MarketIO.h

diff --git a/unsupported/Eigen/src/SparseExtra/MarketIO.h b/unsupported/Eigen/src/SparseExtra/MarketIO.h
index 1618b09..833edd4 100644
--- a/unsupported/Eigen/src/SparseExtra/MarketIO.h
+++ b/unsupported/Eigen/src/SparseExtra/MarketIO.h
@@ -163,7 +163,7 @@
     {
       std::stringstream line(buffer);
       line >> M >> N >> NNZ;
-      if(M > 0 && N > 0 && NNZ > 0) 
+      if(M > 0 && N > 0)
       {
         readsizes = true;
         mat.resize(M,N);