Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/include/sound/control.h b/include/sound/control.h
index e67db28..404acb8 100644
--- a/include/sound/control.h
+++ b/include/sound/control.h
@@ -191,7 +191,7 @@
  * Returns zero if successful or a negative error code.
  *
  * All slaves must be the same type (returning the same information
- * via info callback).  The fucntion doesn't check it, so it's your
+ * via info callback).  The function doesn't check it, so it's your
  * responsibility.
  *
  * Also, some additional limitations: