The ftrace infrastructure uses ftrace_lock to protect several critical
paths. But the functions have that take the ftrace_lock has error paths that
require the lock to be released. Use the guard() helper to take the
ftrace_lock in theses functions which simplify the early exit paths.

Steven Rostedt (5):
      fgraph: Use guard(mutex)(&ftrace_lock) for unregister_ftrace_graph()
      ftrace: Use guard for match_records()
      ftrace: Use guard to lock ftrace_lock in cache_mod()
      ftrace: Use guard to take the ftrace_lock in release_probe()
      ftrace: Use guard to take ftrace_lock in ftrace_graph_set_hash()

----
 kernel/trace/fgraph.c | 10 ++++------
 kernel/trace/ftrace.c | 53 +++++++++++++++++----------------------------------
 2 files changed, 21 insertions(+), 42 deletions(-)