tests/qtest/ahci: Improve error handling (NEGATIVE_RETURNS)

Fix an error handling issue reported by Coverity:

  /qemu/tests/qtest/ahci-test.c: 1452 in prepare_iso()
  1444         int fd = mkstemp(cdrom_path);
  >>>     CID 1432375:  Error handling issues  (NEGATIVE_RETURNS)
  >>>     "fd" is passed to a parameter that cannot be negative.
  1452         ret = write(fd, patt, size);

Reported-by: Coverity (CID 1432375)
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200902080552.159806-1-philmd@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

diff --git a/tests/qtest/ahci-test.c b/tests/qtest/ahci-test.c
index ca4294f44f31079dd23899c2cf09323be06105e0..5e1954852e71af913ce81cd0900fb326d40f882e 100644 (file)
--- a/tests/qtest/ahci-test.c
+++ b/tests/qtest/ahci-test.c
@@ -1443,6 +1443,7 @@ static int prepare_iso(size_t size, unsigned char **buf, char **name)
     ssize_t ret;
     int fd = mkstemp(cdrom_path);
 
+    g_assert(fd != -1);
     g_assert(buf);
     g_assert(name);
     patt = g_malloc(size);