tracing: Check total refcount before releasing bufs in profile_enable failure
When we call the profile_enable() callback of an event, we release the shared perf event tracing buffers unconditionnaly in the failure path. This is wrong because there may be other users of these. Then check the total refcount before doing this. Reported-by: NPaul Mackerras <paulus@samba.org> Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Li Zefan <lizf@cn.fujitsu.com>
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