[PATCH] util/guest-random: Fix size arg to tail memcpy

[Mark Nelson]

We know that in the body of this if statement i is less than len, so
we really should be copying len - i bytes not i - len bytes.

Fix this typo.

Signed-off-by: Mark Nelson <mdnelson8@gmail.com>
---
 util/guest-random.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/util/guest-random.c b/util/guest-random.c
index 086115bd67..23643f86cc 100644
--- a/util/guest-random.c
+++ b/util/guest-random.c
@@ -38,7 +38,7 @@ static int glib_random_bytes(void *buf, size_t len)
     }
     if (i < len) {
         x = g_rand_int(rand);
-        __builtin_memcpy(buf + i, &x, i - len);
+        __builtin_memcpy(buf + i, &x, len - i);
     }
     return 0;
 }
-- 
2.30.2