perf script: Handle -i option for perf script flamegraph

JIRA: https://issues.redhat.com/browse/RHEL-78200

upstream
========
commit df9c299
Author: Tianyou Li <tianyou.li@intel.com>
Date: Tue Jun 10 12:04:22 2025 +0800

description
===========
If specify the perf data file with -i option, the script will try to
read the header information regardless of the file name specified,
instead it will try to access the perf.data. This simple patch use the
file name from -i option for command perf report --header-only to read
the header.

    Signed-off-by: Tianyou Li <tianyou.li@intel.com>
    Reviewed-by: Pan Deng <pan.deng@intel.com>
    Reviewed-by: Zhiguo Zhou <zhiguo.zhou@intel.com>
    Reviewed-by: Wangyang Guo <wangyang.guo@intel.com>
    Reviewed-by: Tim Chen <tim.c.chen@linux.intel.com>
    Link: https://lore.kernel.org/r/20250610040536.2390060-1-tianyou.li@intel.com
    Signed-off-by: Namhyung Kim <namhyung@kernel.org>

Signed-off-by: Anubhav Shelat <ashelat@redhat.com>

Author: AnubhavS1

tools/perf/scripts/python/flamegraph.py

@@ -123,7 +123,13 @@ def get_report_header(self):
             return ""
 
         try:
-            output = subprocess.check_output(["perf", "report", "--header-only"])
+            # if the file name other than perf.data is given,
+            # we read the header of that file
+            if self.args.input:
+                output = subprocess.check_output(["perf", "report", "--header-only", "-i", self.args.input])
+            else:
+                output = subprocess.check_output(["perf", "report", "--header-only"])
+
             return output.decode("utf-8")
         except Exception as err:  # pylint: disable=broad-except
             print("Error reading report header: {}".format(err), file=sys.stderr)