shithub: mcfs

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check whether the file even exists

--- a/main.c

+++ b/main.c

@@ -60,6 +60,8 @@

 		fd = open(*argv, OREAD);

 	else if(argc != 0)

 		usage();

+	if(fd < 0)

+		sysfatal("%r");

 	if(Binits(&f, fd, OREAD, inbuf, Inbufsz) != 0)

 		sysfatal("%r");