Wrong variable name.

libhts/libhts.py

@@ -462,7 +462,7 @@ def size_factor_correlations(counts_data, summaries, normalizer):
             if str(err) == "array must not contain infs or NaNs":
                 msg = (
                     f"Cannot compute Pearson correlation with size factors "
-                    f"when normalizing using {normaliser}")
+                    f"when normalizing using {normalizer}")
                 warnings.warn(msg)
                 return np.nan
             else: