[mlir][emitc] Simplify emitc::isSupportedFloatType (NFC) (#152464)

Author: EtoAndruwa

mlir/lib/Dialect/EmitC/IR/EmitC.cpp

@@ -114,11 +114,8 @@ bool mlir::emitc::isIntegerIndexOrOpaqueType(Type type) {
 bool mlir::emitc::isSupportedFloatType(Type type) {
   if (auto floatType = llvm::dyn_cast<FloatType>(type)) {
     switch (floatType.getWidth()) {
-    case 16: {
-      if (llvm::isa<Float16Type, BFloat16Type>(type))
-        return true;
-      return false;
-    }
+    case 16:
+      return llvm::isa<Float16Type, BFloat16Type>(type);
     case 32:
     case 64:
       return true;