Release ignored error contexts

include/akerror.tmpl.h

@@ -173,9 +173,10 @@ extern akerr_ErrorContext AKERR_ARRAY_ERROR[AKERR_MAX_ARRAY_ERROR];
 extern akerr_ErrorUnhandledErrorHandler akerr_handler_unhandled_error;
 extern akerr_ErrorLogFunction akerr_log_method;
 /*
- * The error IGNORE() last swallowed, per thread: an ignored error is a fact
- * about the thread that ignored it, and one shared slot would have two threads
- * overwriting each other's. Thread local only when AKERR_THREAD_SAFE is 1.
+ * IGNORE()'s per-thread scratch pointer. It is non-NULL only while IGNORE()
+ * logs the swallowed error; IGNORE() releases the context and clears this
+ * pointer before returning to its caller. Thread local only when
+ * AKERR_THREAD_SAFE is 1.
  */
 extern AKERR_THREAD_LOCAL akerr_ErrorContext *__akerr_last_ignored;
 
@@ -437,6 +438,7 @@ akerr_ErrorContext AKERR_NOIGNORE *__akerr_copy_string(char *destination, int ca
     __akerr_last_ignored = __stmt;					\
     if ( __akerr_last_ignored != NULL ) {				\
 	LOG_ERROR_WITH_MESSAGE(__akerr_last_ignored, "** IGNORED ERROR **"); \
+	RELEASE_ERROR(__akerr_last_ignored);				\
     }
 
 #define CLEANUP					\