perf/amd/ibs: Cascade pmu init functions' return value

perf/amd/ibs: Cascade pmu init functions' return value

BugLink: https://bugs.launchpad.net/bugs/1981864
[ Upstream commit 39b2ca75eec8a33e2ffdb8aa0c4840ec3e3b472c ]

IBS pmu initialization code ignores return value provided by
callee functions. Fix it.

Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220509044914.1473-2-ravi.bangoria@amd.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>