update switch sql/expression/function/conv.go

Co-authored-by: James Cor <[email protected]>

Author: elianddb

sql/expression/function/conv.go

@@ -152,8 +152,8 @@ func convertFromBase(ctx *sql.Context, nVal string, fromBase interface{}) interf
 
 	// Handle sign
 	negative := false
-	switch {
-	case nVal[0] == '-':
+	switch case nVal[0] {
+	case '-':
 		if len(nVal) == 1 {
 			return uint64(0)
 		}