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have compiler error out if read fails

--- a/sys/src/cmd/cc/lex.c

+++ b/sys/src/cmd/cc/lex.c

@@ -1262,7 +1262,9 @@

 	if(i->f < 0)

 		goto pop;

 	fi.c = read(i->f, i->b, BUFSIZ) - 1;

-	if(fi.c < 0) {

+	if(fi.c < -1)

+		sysfatal("read error: %r");

+	if(fi.c == -1) {

 		close(i->f);

 		linehist(0, 0);

 		goto pop;

-- 

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