Remove unnecessary memory buffer alloc unsets

This define is turned off by default
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 284aa5f..71c369b 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -919,7 +919,7 @@
     # Build once with -O0, to compile out the i386 specific inline assembly
     msg "build: i386, make, gcc -O0 (ASan build)" # ~ 30s
     scripts/config.pl full
-    make CC=gcc CFLAGS='-O0 -Werror -Wall -Wextra -m32 -fsanitize=address' LDFLAGS='-m32'
+    make CC=gcc CFLAGS='-O0 -Werror -Wall -Wextra -m32 -fsanitize=address' LDFLAGS='-m32 -fsanitize=address'
 
     msg "test: i386, make, gcc -O0 (ASan build)"
     make test