Fix a few glitches in my previous commit.

This makes config(8) WARNS?=6 compliant.

usr.sbin/config/Makefile

@@ -6,7 +6,7 @@ MAN=	config.8
 SRCS=	config.y main.c lang.l mkmakefile.c mkheaders.c \
 	mkoptions.c y.tab.h
 
-WARNS?=	1
+WARNS?=	6
 CFLAGS+= -I. -I${.CURDIR}
 
 DPADD=	${LIBL}

usr.sbin/config/mkmakefile.c

@@ -293,7 +293,7 @@ makefile(void)
 	moveifchanged(path("env.c.new"), path("env.c"));
 }
 
-void
+static void
 read_file(char *fname)
 {
 	FILE *fp;
@@ -542,7 +542,6 @@ static void
 read_files(void)
 {
 	char fname[MAXPATHLEN];
-	FILE *fp;
 	struct files_name *nl, *tnl;
 	
 	if (ident == NULL) {