libknot: avoid calling close(-1) (Coverity)

diff --git a/src/libknot/quic/tls_common.c b/src/libknot/quic/tls_common.c
index 65cab40cc7ae77e2e6536b189d8c7fca82ed1779..4277414fdfe4ad69f2122c98190435f9c5631e62 100644 (file)
--- a/src/libknot/quic/tls_common.c
+++ b/src/libknot/quic/tls_common.c
@@ -284,7 +284,9 @@ static void hash_file(SIPHASH_CTX *ctx, const char *file_name)
        if (fd == -1 ||
            fstat(fd, &file_stat) == -1 ||
            (data = mmap(0, file_stat.st_size, PROT_READ, MAP_SHARED, fd, 0)) == MAP_FAILED) {
-               close(fd);
+               if (fd > -1) {
+                       close(fd);
+               }
                return;
        }