libcrypto potential memory leak in OBJ_NAME_add error path

[Moritz Buhl]

In case lh_OBJ_NAME_insert returns NULL due to a failed malloc, onp
is leaked in OBJ_NAME_add.

Found by CodeChecker.

OK?
mbuhl

Index: lib/libcrypto/objects/o_names.c
===================================================================
RCS file: /cvs/src/lib/libcrypto/objects/o_names.c,v
retrieving revision 1.22
diff -u -p -r1.22 o_names.c
--- lib/libcrypto/objects/o_names.c     29 Jan 2017 17:49:23 -0000      1.22
+++ lib/libcrypto/objects/o_names.c     8 Nov 2022 12:24:47 -0000
@@ -196,6 +196,7 @@ OBJ_NAME_add(const char *name, int type,
                }
                free(ret);
        } else {
+               free(onp);
                if (lh_OBJ_NAME_error(names_lh)) {
                        /* ERROR */
                        return (0);