Drivers: hv: utils: fix memory leak on on_msg() failure

Drivers: hv: utils: fix memory leak on on_msg() failure

inmsg should be freed in case of on_msg() failure to avoid memory leak.
Preserve the error code from on_msg().

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Orabug: 27426102
(cherry picked from commit 1f75338b6fece2bbd42ac3623830c65e2df6e031)
Signed-off-by: Jack Vogel <jack.vogel@oracle.com>
Reviewed-by: Tim Tianyang Chen <tianyang.chen@oracle.com>