[Index] Remove an unnecessary cast (NFC) (#146944)

We don't need to cast twice to the same type.

clang/lib/Index/IndexBody.cpp

diff --git a/clang/lib/Index/IndexBody.cpp b/clang/lib/Index/IndexBody.cpp
index 98ce6f7..1979117 100644
--- a/clang/lib/Index/IndexBody.cpp
+++ b/clang/lib/Index/IndexBody.cpp
@@ -69,7 +69,7 @@
     while (isa<CastExpr>(*It) || isa<ParenExpr>(*It)) {
       if (auto ICE = dyn_cast<ImplicitCastExpr>(*It)) {
         if (ICE->getCastKind() == CK_LValueToRValue)
-          Roles |= (unsigned)(unsigned)SymbolRole::Read;
+          Roles |= (unsigned)SymbolRole::Read;
       }
       if (It == StmtStack.begin())
         break;