tracing: Fix a typo in tracepoint.h
It should be @prev_pid, not @prev_prid.
Link: https://lkml.kernel.org/r/20210802140234.5383-1-shijie@os.amperecomputing.com
Signed-off-by: Huang Shijie <shijie@os.amperecomputing.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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