Suppress Uninitialized variables by Coverity Scan

Coverity Scan says:
```
** CID 1452284: Uninitialized variables (UNINIT)
/eval.c: 223 in rb_ec_cleanup()
```

```
>>> CID 1452284: Uninitialized variables (UNINIT)
>>> Using uninitialized value "errs[1]".
```

1 files changed, 1 insertions, 1 deletions

diff --git a/eval.c b/eval.c
index 00cd56bc5d..3bd70f66c3 100644
--- a/eval.c
+++ b/eval.c
@@ -186,7 +186,7 @@ static int
 rb_ec_cleanup(rb_execution_context_t *ec, volatile int ex)
 {
     int state;
-    volatile VALUE errs[2];
+    volatile VALUE errs[2] = { Qundef, Qundef };
     int nerr;
     rb_thread_t *th = rb_ec_thread_ptr(ec);
     volatile int sysex = EXIT_SUCCESS;