testsuite: Fix alpha static chain register name
diff --git a/testsuite/libffi.go/static-chain.h b/testsuite/libffi.go/static-chain.h
index 56b7e31..3675b40 100644
--- a/testsuite/libffi.go/static-chain.h
+++ b/testsuite/libffi.go/static-chain.h
@@ -1,7 +1,7 @@
#ifdef __aarch64__
# define STATIC_CHAIN_REG "x18"
#elif defined(__alpha__)
-# define STATIC_CHAIN_REG "r1"
+# define STATIC_CHAIN_REG "$1"
#elif defined(__arm__)
# define STATIC_CHAIN_REG "ip"
#elif defined(__sparc__)