trivial: fix an -> a typos in documentation and comments

It is always "an" if there is a vowel _spoken_ (not written).
So it is:
"an hour" (spoken vowel)
but
"a uniform" (spoken 'j')

Signed-off-by: Frederik Schwarzer <schwarzerf@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/sound/oss/aedsp16.c b/sound/oss/aedsp16.c
index a0274f3..3ee9900 100644
--- a/sound/oss/aedsp16.c
+++ b/sound/oss/aedsp16.c
@@ -157,7 +157,7 @@
 
    Started Fri Mar 17 16:13:18 MET 1995
 
-   v0.1 (ALPHA, was an user-level program called AudioExcelDSP16.c)
+   v0.1 (ALPHA, was a user-level program called AudioExcelDSP16.c)
    - Initial code.
    v0.2 (ALPHA)
    - Cleanups.