From 5aae5b5bb2a2c6f7f004b415466a57942421b8db Mon Sep 17 00:00:00 2001
From: practicalswift <practicalswift@users.noreply.github.com>
Date: Fri, 12 Jan 2018 11:18:25 +0100
Subject: [PATCH] Avoid calling fclose(...) with an invalid argument

---
 src/tests.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/tests.c b/src/tests.c
index 580eea7..c312c5a 100644
--- a/src/tests.c
+++ b/src/tests.c
@@ -4924,7 +4924,9 @@ int main(int argc, char **argv) {
             seed16[6] ^= t >> 48;
             seed16[7] ^= t >> 56;
         }
-        fclose(frand);
+        if (frand) {
+            fclose(frand);
+        }
     }
     secp256k1_rand_seed(seed16);