Fix typo in INSTANCE_OF bytecode analysis

Should have been VRegA_22c instead of VRegB_22c.

Test: manual
Change-Id: I0799465a65b45f64eb5cd229c2cf96959067cc97
diff --git a/tools/dexanalyze/dexanalyze_bytecode.cc b/tools/dexanalyze/dexanalyze_bytecode.cc
index 6bc8921..7e9f177 100644
--- a/tools/dexanalyze/dexanalyze_bytecode.cc
+++ b/tools/dexanalyze/dexanalyze_bytecode.cc
@@ -383,7 +383,7 @@
       case Instruction::INSTANCE_OF: {
         uint32_t type_idx = inst->VRegC_22c();
         uint32_t in_reg = inst->VRegB_22c();
-        uint32_t out_reg = inst->VRegB_22c();
+        uint32_t out_reg = inst->VRegA_22c();
         if (count_types_) {
           ++current_type.types_.FindOrAdd(type_idx)->second;
         } else {