Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/net/wan/cosa.c b/drivers/net/wan/cosa.c
index 10bafd5..6fb6f8e 100644
--- a/drivers/net/wan/cosa.c
+++ b/drivers/net/wan/cosa.c
@@ -329,7 +329,7 @@
 static int readmem(struct cosa_data *cosa, char __user *data, int addr, int len);
 static int cosa_reset_and_read_id(struct cosa_data *cosa, char *id);
 
-/* Auxilliary functions */
+/* Auxiliary functions */
 static int get_wait_data(struct cosa_data *cosa);
 static int put_wait_data(struct cosa_data *cosa, int data);
 static int puthexnumber(struct cosa_data *cosa, int number);