compiler: remove superfluous 'err' result in decodeFuncValue

compiler/compiler.go

@@ -1333,10 +1333,7 @@ func (c *Compiler) parseCall(frame *Frame, instr *ssa.CallCommon) (llvm.Value, e
 		value := c.getValue(frame, instr.Value)
 		// This is a func value, which cannot be called directly. We have to
 		// extract the function pointer and context first from the func value.
-		funcPtr, context, err := c.decodeFuncValue(value, instr.Value.Type().Underlying().(*types.Signature))
-		if err != nil {
-			return llvm.Value{}, err
-		}
+		funcPtr, context := c.decodeFuncValue(value, instr.Value.Type().Underlying().(*types.Signature))
 		c.emitNilCheck(frame, funcPtr, "fpcall")
 		return c.parseFunctionCall(frame, instr.Args, funcPtr, context, false), nil
 	}

compiler/func.go

@@ -103,7 +103,7 @@ func (c *Compiler) extractFuncContext(funcValue llvm.Value) llvm.Value {
 
 // decodeFuncValue extracts the context and the function pointer from this func
 // value. This may be an expensive operation.
-func (c *Compiler) decodeFuncValue(funcValue llvm.Value, sig *types.Signature) (funcPtr, context llvm.Value, err error) {
+func (c *Compiler) decodeFuncValue(funcValue llvm.Value, sig *types.Signature) (funcPtr, context llvm.Value) {
 	context = c.builder.CreateExtractValue(funcValue, 0, "")
 	switch c.funcImplementation() {
 	case funcValueDoubleword: