tracing: Fix leak of ring buffer data when new instances creation fails
Yoshihiro Yunomae reported that the ring buffer data for a trace instance does not get properly cleaned up when it fails. He proposed a patch that manually cleaned the data up and addad a bunch of labels. The labels are not needed because all trace array is allocated with a kzalloc which initializes it to 0 and all kfree()s can take a NULL pointer and will ignore it. Adding a new helper function free_trace_buffers() that can also take null buffers to free the buffers that were allocated by allocate_trace_buffers(). Link: http://lkml.kernel.org/r/20140605223522.32311.31664.stgit@yunodevelReported-by:Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@hitachi.com> Signed-off-by:
Steven Rostedt <rostedt@goodmis.org>
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