patch 8.2.5062: Coverity warns for dead code

Problem:    Coverity warns for dead code.
Solution:   Remove the dead code.
diff --git a/src/os_unix.c b/src/os_unix.c
index b23adb7..72f80c9 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -8422,7 +8422,7 @@
     if (ret == 0)
     {
 	alarm_pending = sigismember(&sigs, SIGALRM);
-	ret = ret == 0 ? sigprocmask(SIG_SETMASK, &saved_sigs, NULL) : ret;
+	ret = sigprocmask(SIG_SETMASK, &saved_sigs, NULL);
     }
     if (unlikely(ret != 0 || alarm_pending < 0))
     {