Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/sound/ppc/snd_ps3.c b/sound/ppc/snd_ps3.c
index edce8a2..bc823a5 100644
--- a/sound/ppc/snd_ps3.c
+++ b/sound/ppc/snd_ps3.c
@@ -358,7 +358,7 @@
 		 * filling dummy data, serial automatically start to
 		 * consume them and then will generate normal buffer
 		 * empty interrupts.
-		 * If both buffer underflow and buffer empty are occured,
+		 * If both buffer underflow and buffer empty are occurred,
 		 * it is better to do nomal data transfer than empty one
 		 */
 		snd_ps3_program_dma(card,