Prefer to use RTEST when checking result of `rb_io_wait`. (#5341)

* Prefer to use RTEST when checking result of `rb_io_wait`.

* Consistently use false for signifying no events ready.

1 files changed, 1 insertions, 1 deletions

diff --git a/io.c b/io.c
index f104ff5371..4ed4ee34f8 100644
--- a/io.c
+++ b/io.c
@@ -1483,7 +1483,7 @@ rb_io_maybe_wait(int error, VALUE io, VALUE events, VALUE timeout)
 
       default:
         // Non-specific error, no event is ready:
-        return RB_INT2NUM(0);
+        return Qfalse;
     }
 }