perf scripts python intel-pt-events: Delete unused 'event_attr variable

The 'event_attr' is never used later, the var is ok be deleted.

Additional code simplification is to substitute string slice comparison
with "substring" function. This case no need to know the length specific
words.
Signed-off-by: Alexander Pantyukhin <apantykhin@gmail.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20230114130533.2877-1-apantykhin@gmail.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/scripts/python/intel-pt-events.py

@@ -340,7 +340,6 @@ def print_srccode(comm, param_dict, sample, symbol, dso, with_insn):
 	print(start_str, src_str)
 
 def do_process_event(param_dict):
-	event_attr = param_dict["attr"]
 	sample	   = param_dict["sample"]
 	raw_buf	   = param_dict["raw_buf"]
 	comm	   = param_dict["comm"]
@@ -349,6 +348,7 @@ def do_process_event(param_dict):
 	# callchain  = param_dict["callchain"]
 	# brstack    = param_dict["brstack"]
 	# brstacksym = param_dict["brstacksym"]
+	# event_attr = param_dict["attr"]
 
 	# Symbol and dso info are not always resolved
 	dso    = get_optional(param_dict, "dso")
@@ -359,13 +359,13 @@ def do_process_event(param_dict):
 		print(glb_switch_str[cpu])
 		del glb_switch_str[cpu]
 
-	if name[0:12] == "instructions":
+	if name.startswith("instructions"):
 		if glb_src:
 			print_srccode(comm, param_dict, sample, symbol, dso, True)
 		else:
 			print_instructions_start(comm, sample)
 			print_common_ip(param_dict, sample, symbol, dso)
-	elif name[0:8] == "branches":
+	elif name.startswith("branches"):
 		if glb_src:
 			print_srccode(comm, param_dict, sample, symbol, dso, False)
 		else: