tracing/eprobe: no need to check for negative ret value for snprintf

No need to check for negative return value from snprintf() as the
code does not return negative values.

Link: https://lore.kernel.org/all/20230109040625.3259642-1-quanfafu@gmail.com/



Signed-off-by: Quanfa Fu <quanfafu@gmail.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>