code review changes

wagtailvideos/apps.py

@@ -6,9 +6,9 @@ from django.core.checks import Warning, register
 from wagtailvideos.utils import ffmpeg_installed
 
 
-def ffmpeg_check(app_configs, path=None, **kwargs):
+def ffmpeg_check(app_configs, **kwargs):
     messages = []
-    if not ffmpeg_installed(path=path):
+    if not ffmpeg_installed():
         messages.append(
             Warning(
                 'ffmpeg could not be found on your system. Transcoding will be disabled',

wagtailvideos/utils.py

@@ -7,6 +7,4 @@ except ImportError:
 
 
 def ffmpeg_installed(path=None):
-    if which('ffmpeg', path=path) is None:
-        return False
-    return True
+    return which('ffmpeg', path=path) is not None