Define new IGNORE_ERRORS macro that should be used when errors will be
ignored.

NULL will still work by now, but will break once we implement
IGNORE_ERRORS in a different way later.  Other patches will convert
existing code to use IGNORE_ERRORS.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
 include/qapi/error.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/qapi/error.h b/include/qapi/error.h
index 7e532d00e9..38f7afba2e 100644
--- a/include/qapi/error.h
+++ b/include/qapi/error.h
@@ -66,7 +66,7 @@
  *     }
  *
  * Call a function ignoring errors:
- *     foo(arg, NULL);
+ *     foo(arg, IGNORE_ERRORS);
  *
  * Call a function aborting on errors:
  *     foo(arg, &error_abort);
@@ -117,6 +117,8 @@
 
 #include "qapi-types.h"
 
+#define IGNORE_ERRORS (NULL)
+
 /*
  * Overall category of an error.
  * Based on the qapi type QapiErrorClass, but reproduced here for nicer
-- 
2.11.0.259.g40922b1