remove useless error in Free() method

Author: agoncear-mwb

chdb-purego/chdb.go

@@ -56,12 +56,12 @@ func (c *result) Error() error {
 }
 
 // Free implements ChdbResult.
-func (c *result) Free() error {
+func (c *result) Free() {
 	if c.localResv2 != nil {
 		freeResultV2(c.localResv2)
 		c.localResv2 = nil
 	}
-	return nil
+
 }
 
 // Len implements ChdbResult.

chdb-purego/types.go

@@ -47,7 +47,7 @@ type ChdbResult interface {
 	// If the query had any error during execution, here you can retrieve the cause.
 	Error() error
 	// Free the query result and all the allocated memory
-	Free() error
+	Free()
 }
 
 type ChdbConn interface {