covscan: free ucs2-encoded password copy when generating NTLM hash

On successful code path we leak internal copy of the ucs2-encoded
password.

Fixes: https://pagure.io/freeipa/issue/8131
Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>

util/ipa_pwd_ntlm.c

@@ -103,6 +103,7 @@ int encode_nt_key(char *newPasswd, uint8_t *nt_key)
     }
 
     ret = 0;
+    free(ucs2Passwd);
 
 done:
     return ret;