Fix complex blocks warning when running clippy (apache#1488)

Author: git-hulk

src/dialect/postgresql.rs

@@ -240,14 +240,16 @@ pub fn parse_comment(parser: &mut Parser) -> Result<Statement, ParserError> {
 }
 
 pub fn parse_create(parser: &mut Parser) -> Option<Result<Statement, ParserError>> {
-    match parser.maybe_parse(|parser| -> Result<ObjectName, ParserError> {
+    let name = parser.maybe_parse(|parser| -> Result<ObjectName, ParserError> {
         parser.expect_keyword(Keyword::CREATE)?;
         parser.expect_keyword(Keyword::TYPE)?;
         let name = parser.parse_object_name(false)?;
         parser.expect_keyword(Keyword::AS)?;
         parser.expect_keyword(Keyword::ENUM)?;
         Ok(name)
-    }) {
+    });
+
+    match name {
         Ok(name) => name.map(|name| parse_create_type_as_enum(parser, name)),
         Err(e) => Some(Err(e)),
     }