rtla/timerlat: Fix "Previous IRQ" auto analysis' line

The "Previous IRQ interference" line is misaligned and without
a \n, breaking the tool's output:

## CPU 12 hit stop tracing, analyzing it ##
Previous IRQ interference: up to 2.22 us IRQ handler delay: 18.06 us (0.00 %)
IRQ latency: 18.52 us
Timerlat IRQ duration: 4.41 us (0.00 %)
Blocking thread: 216.93 us (0.03 %)

Fix the output:

## CPU 7 hit stop tracing, analyzing it ##
Previous IRQ interference: up to 8.93 us
IRQ handler delay: 0.98 us (0.00 %)
IRQ latency: 2.95 us
Timerlat IRQ duration: 11.26 us (0.03 %)

Link: https://lore.kernel.org/linux-trace-devel/[e-mail]

Fixes: 27e348b221f6 ("rtla/timerlat: Add auto-analysis core")
Cc: Masami Hiramatsu <[e-mail]>
Signed-off-by: Daniel Bristot de Oliveira <[e-mail]>
Signed-off-by: Steven Rostedt (Google) <[e-mail]>

tools/tracing/rtla/src/timerlat_aa.c

···
 	exp_irq_ts = taa_data->timer_irq_start_time - taa_data->timer_irq_start_delay;
 
 	if (exp_irq_ts < taa_data->prev_irq_timstamp + taa_data->prev_irq_duration)
-		printf("  Previous IRQ interference:	\t	up to %9.2f us",
+		printf("  Previous IRQ interference:	\t\t up to  %9.2f us\n",
 			ns_to_usf(taa_data->prev_irq_duration));
 
 	/*