FIX: correction of the return value in histo_utils.cxx, now compiling

src/histo_utils.cxx

@@ -225,7 +225,7 @@ short compute_snowline_internal(const itk::VectorImage<short, 2>::Pointer compos
     myfile << "Number of bins=0" << std::endl;
     myfile.close();
     // Return -1000 as no zs is found in this case
-    return -1OOO;
+    return -1000;
     }