headers: make server key reader private

fn.h

@@ -39,7 +39,6 @@ void	backvi(Im*);
 void	dictsend(Im*, Str*);
 uvlong	ownernew(void);
 
-int	srvreadkey(int, Keyreq*);
 void	srvthread(void*);
 void	ibusthread(void*);
 

srv.c

@@ -14,7 +14,7 @@ struct Client
 	uvlong	owner;
 };
 
-int
+static int
 srvreadkey(int fd, Keyreq *kr)
 {
 	uchar req[Ipcreqsz];