rtla/osnoise: Fix error message when failing to enable trace instance

When a trace instance creation fails, tools are printing:

	Could not enable -> osnoiser <- tracer for tracing

Print the actual (and correct) name of the tracer it fails to enable.

Link: https://lkml.kernel.org/r/53ef0582605af91eca14b19dba9fc9febb95d4f9.1645206561.git.bristot@kernel.org

Fixes: b169637 ("rtla: Helper functions for rtla")
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

tools/tracing/rtla/src/osnoise.c

@@ -810,7 +810,7 @@ struct osnoise_tool *osnoise_init_trace_tool(char *tracer)
 
 	retval = enable_tracer_by_name(trace->trace.inst, tracer);
 	if (retval) {
-		err_msg("Could not enable osnoiser tracer for tracing\n");
+		err_msg("Could not enable %s tracer for tracing\n", tracer);
 		goto out_err;
 	}