[llvm] [flang-rt] Fixed uninitialized class member variable (PR #127681)

[Eugene Epshteyn via llvm-commits]

https://github.com/eugeneepshteyn created https://github.com/llvm/llvm-project/pull/127681

valgrind complained that `OpenStatementState::pathLength_` was used before it was initialized, when a file was opened with `status='scratch'`. The code seems to expect that `pathLengh_` should be initialized to 0, so added default initialization to the declaration.

>From 0d0f4193fd324ab263e93c7cbd9be6625e74057f Mon Sep 17 00:00:00 2001
From: Eugene Epshteyn <eepshteyn at nvidia.com>
Date: Tue, 18 Feb 2025 13:29:42 -0500
Subject: [PATCH] [flang-rt] Fixed uninitialized class member variable

valgrind complained that `OpenStatementState::pathLength_` was used before it
was initialized, when a file was opened with `status='scratch'`. The code
seems to expect that `pathLengh_` should be initialized to 0, so added default
initialization to the declaration.
---
 flang-rt/include/flang-rt/runtime/io-stmt.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/flang-rt/include/flang-rt/runtime/io-stmt.h b/flang-rt/include/flang-rt/runtime/io-stmt.h
index a364ddfd9b3c7..33cc91271ab12 100644
--- a/flang-rt/include/flang-rt/runtime/io-stmt.h
+++ b/flang-rt/include/flang-rt/runtime/io-stmt.h
@@ -627,7 +627,7 @@ class OpenStatementState : public ExternalIoStatementBase {
   Fortran::common::optional<Action> action_;
   Convert convert_{Convert::Unknown};
   OwningPtr<char> path_;
-  std::size_t pathLength_;
+  std::size_t pathLength_{};
   Fortran::common::optional<bool> isUnformatted_;
   Fortran::common::optional<Access> access_;
 };