Don't duplicate check_abi()

src/helpers.rs

@@ -169,9 +169,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
         let this = self.eval_context_mut();
         let param_env = ty::ParamEnv::reveal_all(); // in Miri this is always the param_env we use... and this.param_env is private.
         let callee_abi = f.ty(*this.tcx, param_env).fn_sig(*this.tcx).abi();
-        if callee_abi != caller_abi {
-            throw_ub_format!("calling a function with ABI {} using caller ABI {}", callee_abi.name(), caller_abi.name())
-        }
+        check_abi(caller_abi, callee_abi)?;
 
         // Push frame.
         let mir = &*this.load_mir(f.def, None)?;