aom: av1_rtcd_defs.pl: always initialize $sse2_x86

From fb86a39f27d6cd514db1b7ff1941d5562ca010ea Mon Sep 17 00:00:00 2001
From: James Zern <[EMAIL REDACTED]>
Date: Fri, 8 Mar 2024 19:40:30 -0800
Subject: [PATCH] av1_rtcd_defs.pl: always initialize $sse2_x86

fixes a build warning:
  Use of uninitialized value $opt in concatenation (.) or string at
  build/cmake/rtcd.pl line 88.
after:
  8fbd5fb331 Restore a couple of SIMD functions for x86

Change-Id: Ib48b285cece4029e43a903a0e8e9f161bd110596
---
 av1/common/av1_rtcd_defs.pl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/av1/common/av1_rtcd_defs.pl b/av1/common/av1_rtcd_defs.pl
index 2370ce053..f0afc48ad 100644
--- a/av1/common/av1_rtcd_defs.pl
+++ b/av1/common/av1_rtcd_defs.pl
@@ -81,7 +81,7 @@ ()
 # For normal use, we require SSE4.1. However, 32-bit Valgrind does not support
 # SSE4.1, so we include fallbacks for some critical functions to improve
 # performance
-$ssse3_x86 = '';
+$sse2_x86 = $ssse3_x86 = '';
 if ($opts{arch} eq "x86") {
   $sse2_x86 = 'sse2';
   $ssse3_x86 = 'ssse3';