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/hamradio/Makefile b/drivers/net/hamradio/Makefile
index 9def867..10409607 100644
--- a/drivers/net/hamradio/Makefile
+++ b/drivers/net/hamradio/Makefile
@@ -3,7 +3,7 @@
 #
 #
 # 19971130 	Moved the amateur radio related network drivers from 
-#		drivers/net/ to drivers/hamradio for easier maintainance.
+#		drivers/net/ to drivers/hamradio for easier maintenance.
 #               Joerg Reuter DL1BKE <jreuter@yaina.de>
 #
 # 20000806	Rewritten to use lists instead of if-statements.