[PATCH fixes] MIPS: perf: Fix build with CONFIG_CPU_BMIPS5000 enabled

[Florian Fainelli]

The 'event' variable may be unused in case only CONFIG_CPU_BMIPS5000
being enabled:

arch/mips/kernel/perf_event_mipsxx.c: In function 'mipsxx_pmu_enable_event':
arch/mips/kernel/perf_event_mipsxx.c:326:21: error: unused variable 'event' 
[-Werror=unused-variable]
  struct perf_event *event = container_of(evt, struct perf_event, hw);
                     ^~~~~

Fixes: 84002c88599d ("MIPS: perf: Fix perf with MT counting other threads")
Signed-off-by: Florian Fainelli <f.faine...@gmail.com>
---
 arch/mips/kernel/perf_event_mipsxx.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/mips/kernel/perf_event_mipsxx.c 
b/arch/mips/kernel/perf_event_mipsxx.c
index 413863508f6f..739b7ff9fdab 100644
--- a/arch/mips/kernel/perf_event_mipsxx.c
+++ b/arch/mips/kernel/perf_event_mipsxx.c
@@ -323,7 +323,9 @@ static int mipsxx_pmu_alloc_counter(struct cpu_hw_events 
*cpuc,
 
 static void mipsxx_pmu_enable_event(struct hw_perf_event *evt, int idx)
 {
+#ifndef CONFIG_CPU_BMIPS5000
        struct perf_event *event = container_of(evt, struct perf_event, hw);
+#endif
        struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
 #ifdef CONFIG_MIPS_MT_SMP
        unsigned int range = evt->event_base >> 24;
-- 
2.17.1