[PATCH 7/7] backends/rng-random: Get rid of qemu_open_old()

[Zhao Liu <zhao1.liu@intel.com>]

For qemu_open_old(), osdep.h said:

> Don't introduce new usage of this function, prefer the following
> qemu_open/qemu_create that take an "Error **errp".

So replace qemu_open_old() with qemu_open(). And considering
rng_random_opened() will lose its obvious error handling case after
removing error_setg_file_open(), add comment to remind here.

Cc: Laurent Vivier <lvivier@redhat.com>
Cc: Amit Shah <amit@kernel.org>
Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
---
 backends/rng-random.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/backends/rng-random.c b/backends/rng-random.c
index 80eb5be138ce..3cdb982533b5 100644
--- a/backends/rng-random.c
+++ b/backends/rng-random.c
@@ -75,10 +75,11 @@ static void rng_random_opened(RngBackend *b, Error **errp)
         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
                    "filename", "a valid filename");
     } else {
-        s->fd = qemu_open_old(s->filename, O_RDONLY | O_NONBLOCK);
-        if (s->fd == -1) {
-            error_setg_file_open(errp, errno, s->filename);
-        }
+        /*
+         * Once the open fails, the error message is integrated into
+         * the *errp object by qemu_open().
+         */
+        s->fd = qemu_open(s->filename, O_RDONLY | O_NONBLOCK, errp);
     }
 }
 
-- 
2.34.1