Default "send_files" state to FALSE rather than TRUE, so if no files are even

attempted to be sent (e.g. there are file open failures for all files), then we
won't call zmodem_get_zfin() - we never sent a ZINIT! Just return -1.

src/sbbs3/sexyz.c

@@ -920,7 +920,7 @@ static int send_files(char** fname, uint fnames)
 	uint		cps;
 	glob_t		g;
 	int			gi;
-	BOOL		success=TRUE;
+	BOOL		success=FALSE;
 	uint64_t	fsize;
 	uint64_t	sent_bytes;
 	uint64_t	total_bytes=0;