Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/char/agp/sworks-agp.c b/drivers/char/agp/sworks-agp.c
index 13acaaf..f02f9b0 100644
--- a/drivers/char/agp/sworks-agp.c
+++ b/drivers/char/agp/sworks-agp.c
@@ -229,7 +229,7 @@
  * This routine could be implemented by taking the addresses
  * written to the GATT, and flushing them individually.  However
  * currently it just flushes the whole table.  Which is probably
- * more efficent, since agp_memory blocks can be a large number of
+ * more efficient, since agp_memory blocks can be a large number of
  * entries.
  */
 static void serverworks_tlbflush(struct agp_memory *temp)