Fix one-byte buffer overflow: NUL gets written to the buffer, but isn't

counted in the width specification in scanf.

This is not a security problem, since this function is only used to
parse a user's configuration file.

Submitted by:	Joerg Sonnenberger
Obtained from:	dragonflybsd
MFC after:	1 week

lib/libfetch/common.c

@@ -655,7 +655,7 @@ fetch_read_word(FILE *f)
 {
 	static char word[1024];
 
-	if (fscanf(f, " %1024s ", word) != 1)
+	if (fscanf(f, " %1023s ", word) != 1)
 		return (NULL);
 	return (word);
 }