tracing: fprobe: Fix to lock module while registering fprobe

Since register_fprobe() does not get the module reference count while
registering fgraph filter, if the target functions (symbols) are in
modules, those modules can be unloaded when registering fprobe to
fgraph.

To avoid this issue, get the reference counter of module for each
symbol, and put it after register the fprobe.

Link: https://lore.kernel.org/all/174330568792.459674.16874380163991113156.stgit@devnote2/



Reported-by: Steven Rostedt <rostedt@goodmis.org>
Closes: https://lore.kernel.org/all/20250325130628.3a9e234c@gandalf.local.home/


Fixes: 4346ba16 ("fprobe: Rewrite fprobe on function-graph tracer")
Cc: stable@vger.kernel.org
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>