Report failing filenames when --fix=no in mixed-line-endings

pre_commit_hooks/mixed_line_ending.py

diff --git a/pre_commit_hooks/mixed_line_ending.py b/pre_commit_hooks/mixed_line_ending.py
index a163726..cd0c125 100644
--- a/pre_commit_hooks/mixed_line_ending.py
+++ b/pre_commit_hooks/mixed_line_ending.py
@@ -37,9 +37,15 @@
     # Some amount of mixed line endings
     mixed = sum(bool(x) for x in counts.values()) > 1
 
-    if fix == 'no' or (fix == 'auto' and not mixed):
+    if fix == 'no':
+        if mixed:
+            # Not fixing, just report problematic file
+            print('Mixed line endings: {filename}'.format(filename=filename))
         return mixed
 
+    if fix == 'auto' and not mixed:
+        return False
+
     if fix == 'auto':
         max_ending = LF
         max_lines = 0