perf header: Pass "cpu" pmu name while printing caps

Avoid unnecessary conditional code to check if pmu name is NULL
or not by passing "cpu" pmu name to the printing function.

Reviewed-by: Kan Liang <[e-mail]>
Signed-off-by: Ravi Bangoria <[e-mail]>
Acked-by: Namhyung Kim <[e-mail]>
Cc: Ananth Narayan <[e-mail]>
Cc: Andi Kleen <[e-mail]>
Cc: Borislav Petkov <[e-mail]>
Cc: Ian Rogers <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: James Clark <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Kim Phillips <[e-mail]>
Cc: Leo Yan <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Robert Richter <[e-mail]>
Cc: Sandipan Das <[e-mail]>
Cc: Santosh Shukla <[e-mail]>
Cc: Stephane Eranian <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/util/header.c

···
 	char *str, buf[128];
 
 	if (!nr_caps) {
-		if (!pmu_name)
-			fprintf(fp, "# cpu pmu capabilities: not available\n");
-		else
-			fprintf(fp, "# %s pmu capabilities: not available\n", pmu_name);
+		fprintf(fp, "# %s pmu capabilities: not available\n", pmu_name);
 		return;
 	}
 
-	if (!pmu_name)
-		scnprintf(buf, sizeof(buf), "# cpu pmu capabilities: ");
-	else
-		scnprintf(buf, sizeof(buf), "# %s pmu capabilities: ", pmu_name);
+	scnprintf(buf, sizeof(buf), "# %s pmu capabilities: ", pmu_name);
 
 	delimiter = buf;
 
···
 static void print_cpu_pmu_caps(struct feat_fd *ff, FILE *fp)
 {
 	print_per_cpu_pmu_caps(fp, ff->ph->env.nr_cpu_pmu_caps,
-			       ff->ph->env.cpu_pmu_caps, NULL);
+			       ff->ph->env.cpu_pmu_caps, (char *)"cpu");
 }
 
 static void print_hybrid_cpu_pmu_caps(struct feat_fd *ff, FILE *fp)