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cpp: fd <= 0 vs. fd < 0

--- a/sys/src/cmd/cpp/nlist.c

+++ b/sys/src/cmd/cpp/nlist.c

@@ -168,7 +168,7 @@

 			dp[len] = '\0';

 		}

 		fp = (char*)newstring((uchar*)argv[0], strlen(argv[0]), 0);

-		if ((fd = open(fp, 0)) <= 0)

+		if ((fd = open(fp, 0)) < 0)

 			error(FATAL, "Can't open input file %s", fp);

 	}

 	if (argc > 1) {