DAOS-15717 bug: Fix memory leak cid 2555536 (#14231)

- Fix mem leak for coverity 2555536

Signed-off-by: Alexander A Oganezov <[email protected]>

src/mgmt/cli_mgmt.c

@@ -239,13 +239,15 @@ get_env_deprecated(char **val, const char *new_env, const char *old_env)
 			D_WARN("Both %s and %s are set! Deprecated %s (%s) will be ignored\n",
 			       new_env, old_env, old_env, old);
 		*val = new;
+		d_freeenv_str(&old);
 		return 0;
 	}
 
 	if (rc_old == 0) {
 		D_INFO("%s is deprecated, upgrade your environment to use %s instead\n", old_env,
 		       new_env);
 		*val = old;
+		d_freeenv_str(&new);
 		return 0;
 	}