fix comment typo in netdevice.h

Fix missing "of" in comment.
Signed-off-by: Justin P. Mattock <justinmattock@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

include/linux/netdevice.h

@@ -775,7 +775,7 @@ struct net_device {
 	/*
 	 * This is the first field of the "visible" part of this structure
 	 * (i.e. as seen by users in the "Space.c" file).  It is the name
-	 * the interface.
+	 * of the interface.
 	 */
 	char			name[IFNAMSIZ];