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libdraw: have openfont() set error string

--- a/sys/src/libdraw/openfont.c

+++ b/sys/src/libdraw/openfont.c

@@ -37,8 +37,10 @@

 	Font *fnt;

 	char *buf;

-	if((buf = readfile(name)) == nil)

+	if((buf = readfile(name)) == nil){

+		werrstr("openfont: %r");

 		return nil;

+	}

 	fnt = buildfont(d, buf, name);

 	free(buf);

 	return fnt;