made magic_file_path only apply in windows

Author: epicfaace

validatedfile/fields.py

@@ -3,6 +3,7 @@
 from django.template.defaultfilters import filesizeformat
 from django.utils.translation import ugettext as _
 from django.conf import settings
+import os
 
 import magic
 
@@ -20,9 +21,10 @@ def clean(self, *args, **kwargs):
 
         if self.content_types:
             uploaded_content_type = getattr(file, 'content_type', '')
-
+            
+            # magic_file_path used only for Windows.
             magic_file_path = getattr(settings, "MAGIC_FILE_PATH", None)
-            if magic_file_path:
+            if magic_file_path and os.name == 'nt':
                 mg = magic.Magic(mime=True, magic_file=magic_file_path)
             else:
                 mg = magic.Magic(mime=True)