When adding an alarm, if an error happen when registering
the common alarm callback, it is not considered as a major failure.
The alarm is then inserted in the list.
However it was returning an error code after inserting the alarm.

The error code is reset to 0 so the behaviour and the return code
are consistent.
Other return code related lines are cleaned up for easier understanding.

Fixes: af75078fece3 ("first public release")
Cc: sta...@dpdk.org

Signed-off-by: Thomas Monjalon <tho...@monjalon.net>
---
 lib/librte_eal/linux/eal/eal_alarm.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/librte_eal/linux/eal/eal_alarm.c 
b/lib/librte_eal/linux/eal/eal_alarm.c
index 840ede780..d6d70e8c3 100644
--- a/lib/librte_eal/linux/eal/eal_alarm.c
+++ b/lib/librte_eal/linux/eal/eal_alarm.c
@@ -137,9 +137,13 @@ rte_eal_alarm_set(uint64_t us, rte_eal_alarm_callback 
cb_fn, void *cb_arg)
 
        rte_spinlock_lock(&alarm_list_lk);
        if (!handler_registered) {
-               ret |= rte_intr_callback_register(&intr_handle,
+               ret = rte_intr_callback_register(&intr_handle,
                                eal_alarm_callback, NULL);
-               handler_registered = (ret == 0) ? 1 : 0;
+               if (ret == 0)
+                       handler_registered = 1;
+               else
+                       /* not fatal, callback can be registered later */
+                       ret = 0;
        }
 
        if (LIST_EMPTY(&alarm_list))
-- 
2.21.0

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