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/hostess_sv11.c b/drivers/net/wan/hostess_sv11.c
index 48edc5f..e817583 100644
--- a/drivers/net/wan/hostess_sv11.c
+++ b/drivers/net/wan/hostess_sv11.c
@@ -15,7 +15,7 @@
  *	The hardware does the bus handling to avoid the need for delays between
  *	touching control registers.
  *
- *	Port B isnt wired (why - beats me)
+ *	Port B isn't wired (why - beats me)
  *
  *	Generic HDLC port Copyright (C) 2008 Krzysztof Halasa <khc@pm.waw.pl>
  */