[PATCH 1/2] perf treport: Initialize the subtitle in the constructor

[Leo Yan <leo.yan@arm.com>]

For Arm64 cross build without Textual, assignments outside __init__()
trigger pylint warning:

  ************* Module treport
  python/treport.py:625:8: W0201: Attribute 'sub_title' defined outside __init__ (attribute-defined-outside-init)
  python/treport.py:629:12: W0201: Attribute 'sub_title' defined outside __init__ (attribute-defined-outside-init)
  python/treport.py:668:8: W0201: Attribute 'sub_title' defined outside __init__ (attribute-defined-outside-init)
  python/treport.py:675:8: W0201: Attribute 'sub_title' defined outside __init__ (attribute-defined-outside-init)

  ------------------------------------------------------------------
  Your code has been rated at 9.91/10 (previous run: 9.91/10, +0.00)

Move the initial subtitle assignment from on_mount() to
ReportApp.__init__() so pylint can see the attribute initialization
without resolving the Textual base class.

Fixes: b379b70b7b7b ("perf treport: Show the profile while it loads")
Signed-off-by: Leo Yan <leo.yan@arm.com>
---
 tools/perf/python/treport.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/python/treport.py b/tools/perf/python/treport.py
index e021214753707780343e79dfc6964b9c69698197..f8c95ac1c6e067e8291eed59530f31c77886df68 100755
--- a/tools/perf/python/treport.py
+++ b/tools/perf/python/treport.py
@@ -602,6 +602,7 @@ class ReportApp(App):
         """
         super().__init__()
         self.input_file = input_file
+        self.sub_title = input_file
         self.root = root if root else ProfileNode("root", parent=None)
         self.loaded = root is not None
         # Held when reading or changing the profile, which is built in a
@@ -622,7 +623,6 @@ class ReportApp(App):
 
     def on_mount(self) -> None:
         """Start loading the profile unless it was given."""
-        self.sub_title = self.input_file
         if self.loaded:
             self.update_views()
         else:

-- 
2.34.1