talloc: save errno over talloc_free

As we start to use errno more, it's a huge pain if talloc_free() can blatt
it (esp. destructors).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

diff --git a/lib/talloc/talloc.c b/lib/talloc/talloc.c
index b805c9725cd361213fe345d535b35510f473c601..8e11a1121829d2f05b8e77072e78bec54c9b0f3c 100644 (file)
--- a/lib/talloc/talloc.c
+++ b/lib/talloc/talloc.c
@@ -746,7 +746,12 @@ void *talloc_named_const(const void *context, size_t size, const char *name)
 */
 int talloc_free(void *ptr)
 {
-       return _talloc_free(ptr);
+       int ret, saved_errno;
+
+       saved_errno = errno;
+       ret = _talloc_free(ptr);
+       errno = saved_errno;
+       return ret;
 }