Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/isdn/hisax/st5481_b.c b/drivers/isdn/hisax/st5481_b.c
index e56e5af..ed4bc56 100644
--- a/drivers/isdn/hisax/st5481_b.c
+++ b/drivers/isdn/hisax/st5481_b.c
@@ -124,7 +124,7 @@
 }
 
 /*
- * Start transfering (flags or data) on the B channel, since
+ * Start transferring (flags or data) on the B channel, since
  * FIFO counters has been set to a non-zero value.
  */
 static void st5481B_start_xfer(void *context)