BUG/MINOR: ssl_ckch: Free error msg if commit changes on a CA/CRL entry fails

On the CLI, If we fail to commit changes on a CA or a CRL entry, an error
message is returned. This error must be released.

This patch must be backported as far as 2.4.

src/ssl_ckch.c

@@ -2941,6 +2941,7 @@ error:
 		applet_putchk(appctx, trash);
 		free_trash_chunk(trash);
 	}
+	free(err);
 	/* error: call the release function and don't come back */
 	return 1;
 }