perf: RISC-V: Add of_node_put() when breaking out of for_each_of_cpu_node()

In pmu_sbi_setup_irqs(), we should call of_node_put() for the 'cpu'
when breaking out of for_each_of_cput_node() as its refcount will
be automatically increased and decreased during the iteration.

Fixes: 4905ec2f

 ("RISC-V: Add sscofpmf extension support")
Signed-off-by: Liang He <windhl@126.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Link: https://lore.kernel.org/r/20220715130330.443363-1-windhl@126.com


Signed-off-by: Will Deacon <will@kernel.org>