[gcc(refs/users/aoliva/heads/testme)] silence warnings

[Alexandre Oliva]

https://gcc.gnu.org/g:42ded389f97884490972bbf51a2993dcac57e690

commit 42ded389f97884490972bbf51a2993dcac57e690
Author: Alexandre Oliva <oliva@adacore.com>
Date:   Thu Jul 28 03:30:24 2022 -0300

    silence warnings

Diff:
---
 gcc/optabs.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/optabs.cc b/gcc/optabs.cc
index 165f8d1fa22..7a4eff12951 100644
--- a/gcc/optabs.cc
+++ b/gcc/optabs.cc
@@ -255,7 +255,7 @@ expand_widen_pattern_expr (sepops ops, rtx op0, rtx op1, rtx wide_op,
 			   rtx target, int unsignedp)
 {
   class expand_operand eops[4];
-  tree oprnd0, oprnd1, oprnd2;
+  tree oprnd0, oprnd1 = NULL_TREE, oprnd2 = NULL_TREE;
   machine_mode wmode = VOIDmode, tmode0, tmode1 = VOIDmode;
   optab widen_pattern_optab;
   enum insn_code icode;