ALSA: seq: Do error checks at creating system ports

ALSA: seq: Do error checks at creating system ports

BugLink: https://bugs.launchpad.net/bugs/1853915
[ Upstream commit b8e131542b47b81236ecf6768c923128e1f5db6e ]

snd_seq_system_client_init() doesn't check the errors returned from
its port creations.  Let's do it properly and handle the error paths.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>