mpd: Fix review comments

docs/changelog.rst

@@ -41,6 +41,7 @@ Bug fix release.
 
 - MPD: Add ``volume`` command that was reintroduced, though still as a
   deprecated command, in MPD 0.18 and is in use by some clients like mpc.
+  (Fixes: :issue:`1393`, PR: :issue:`1397`)
 
 - Proxy: Handle case where :confval:`proxy/port` is either missing from config
   or set to an empty string. (PR: :issue:`1371`)

mopidy/mpd/protocol/playback.py

@@ -440,7 +440,7 @@ def volume(context, change):
         Note: ``volume`` is deprecated, use ``setvol`` instead.
     """
     if change < -100 or change > 100:
-        raise exceptions.MpdArgError('Invalid volume value', command='volume')
+        raise exceptions.MpdArgError('Invalid volume value')
 
     old_volume = context.core.mixer.get_volume().get()
     if old_volume is None: