[PATCH] tools: fread does not return negative on error

[Roel Kluin <roel.kluin@gmail.com>]

size_t res cannot be less than 0. fread returns 0 on error.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
---
Is this correct? please review.

diff --git a/tools/perf/util/strbuf.c b/tools/perf/util/strbuf.c
index eaba093..376a337 100644
--- a/tools/perf/util/strbuf.c
+++ b/tools/perf/util/strbuf.c
@@ -259,7 +259,7 @@ size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
 	res = fread(sb->buf + sb->len, 1, size, f);
 	if (res > 0)
 		strbuf_setlen(sb, sb->len + res);
-	else if (res < 0 && oldalloc == 0)
+	else if (res == 0 && oldalloc == 0)
 		strbuf_release(sb);
 	return res;
 }