Fix typo bug for Mips32.

Change-Id: I429038ee6748d538fa03da819777f3456a4fd9a5
diff --git a/runtime/arch/mips/quick_entrypoints_mips.S b/runtime/arch/mips/quick_entrypoints_mips.S
index fb79238..a0fc6d2 100644
--- a/runtime/arch/mips/quick_entrypoints_mips.S
+++ b/runtime/arch/mips/quick_entrypoints_mips.S
@@ -1313,7 +1313,7 @@
     sll     $a1, 1
     sll     $a1, $a0                         #  ahi<- ahi << (32-(shift&31))
     andi    $a2, 0x20                        #  shift & 0x20
-    beqz    $s2, 1f
+    beqz    $a2, 1f
     or      $v0, $a1                         #  rlo<- rlo | ahi
 
     move    $v0, $v1                         #  rlo<- rhi (if shift&0x20)