Small update to err.[ch]

cli.c

@@ -24,6 +24,8 @@
 #include "err.h"
 #include "otp.h"
 
+extern const char *__progname;
+
 static void
 usage(void)
 {

err.c

@@ -12,6 +12,11 @@
  * along with this software. If not, see
  * <http://creativecommons.org/publicdomain/zero/1.0/>.
  */
+/*
+ * Inspired by OpenBSD's `err.h' header, found at
+ * http://man.openbsd.org/err.3
+ * http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/lib/libc/gen/verr.c
+ */
 
 #include <errno.h>
 #include <stdarg.h>
@@ -21,6 +26,8 @@
 
 #include "err.h"
 
+extern const char *__progname;
+
 void
 err(int eval, const char *fmt, ...)
 {

err.h

@@ -13,8 +13,6 @@
  * <http://creativecommons.org/publicdomain/zero/1.0/>.
  */
 
-extern const char *__progname;
-
 void err(int, const char *, ...);
 void errx(int, const char *, ...);
 void warn(const char *, ...);