Add ERR_clear_last_mark()

This allows callers to set a mark, and then clear it without removing
the errors.  Useful in case an error is encountered that should be
returned up the call stack.

Reviewed-by: Andy Polyakov <appro@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4094)

1 files changed, 1 insertions, 0 deletions

diff --git a/include/openssl/err.h b/include/openssl/err.h
index 8b266f9d5c..a602660c14 100644
--- a/include/openssl/err.h
+++ b/include/openssl/err.h
@@ -262,6 +262,7 @@ int ERR_get_next_error_library(void);
 
 int ERR_set_mark(void);
 int ERR_pop_to_mark(void);
+int ERR_clear_last_mark(void);
 
 #ifdef  __cplusplus
 }