Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 5e47757..6ec33b6 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -1182,7 +1182,7 @@
 /*
  * parse a feature unit
  *
- * most of controlls are defined here.
+ * most of controls are defined here.
  */
 static int parse_audio_feature_unit(struct mixer_build *state, int unitid, void *_ftr)
 {