tracing: trace_fprobe: Fix typo of the semicolon

Fix a typo that uses ',' instead of ';' for line delimiter.

Link: https://lore.kernel.org/linux-trace-kernel/175366879192.487099.5714468217360139639.stgit@mhiramat.tok.corp.google.com/



Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>