alpha: remove unused variable

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Richard Henderson  <rth@twiddle.net>
diff --git a/target-alpha/translate.c b/target-alpha/translate.c
index 5d7454c..936760c 100644
--- a/target-alpha/translate.c
+++ b/target-alpha/translate.c
@@ -1661,7 +1661,10 @@
 static ExitStatus translate_one(DisasContext *ctx, uint32_t insn)
 {
     uint32_t palcode;
-    int32_t disp21, disp16, disp12;
+    int32_t disp21, disp16;
+#ifndef CONFIG_USER_ONLY
+    int32_t disp12;
+#endif
     uint16_t fn11;
     uint8_t opc, ra, rb, rc, fpfn, fn7, islit, real_islit;
     uint8_t lit;
@@ -1681,7 +1684,9 @@
     palcode = insn & 0x03FFFFFF;
     disp21 = ((int32_t)((insn & 0x001FFFFF) << 11)) >> 11;
     disp16 = (int16_t)(insn & 0x0000FFFF);
+#ifndef CONFIG_USER_ONLY
     disp12 = (int32_t)((insn & 0x00000FFF) << 20) >> 20;
+#endif
     fn11 = (insn >> 5) & 0x000007FF;
     fpfn = fn11 & 0x3F;
     fn7 = (insn >> 5) & 0x0000007F;