Fix clippy warnings

Allow `unnecessary_wraps` for `check_update` and `check_no_tail`.
Remove `check_readonly` (`sqlite3-parser` may help).

src/raw_statement.rs

@@ -170,6 +170,7 @@ impl RawStatement {
         r
     }
 
+    // does not work for PRAGMA
     #[inline]
     #[cfg(all(feature = "extra_check", feature = "modern_sqlite"))] // 3.7.4
     pub fn readonly(&self) -> bool {

src/statement.rs

@@ -220,7 +220,6 @@ impl Statement<'_> {
     /// Will return `Err` if binding parameters fails.
     #[inline]
     pub fn query<P: Params>(&mut self, params: P) -> Result<Rows<'_>> {
-        self.check_readonly()?;
         params.__bind_in(self)?;
         Ok(Rows::new(self))
     }
@@ -718,21 +717,6 @@ impl Statement<'_> {
         self.conn.decode_result(stmt.finalize())
     }
 
-    #[cfg(not(feature = "modern_sqlite"))]
-    #[inline]
-    fn check_readonly(&self) -> Result<()> {
-        Ok(())
-    }
-
-    #[cfg(feature = "modern_sqlite")]
-    #[inline]
-    fn check_readonly(&self) -> Result<()> {
-        /*if !self.stmt.readonly() { does not work for PRAGMA
-            return Err(Error::InvalidQuery);
-        }*/
-        Ok(())
-    }
-
     #[cfg(all(feature = "modern_sqlite", feature = "extra_check"))]
     #[inline]
     fn check_update(&self) -> Result<()> {
@@ -755,6 +739,7 @@ impl Statement<'_> {
 
     #[cfg(not(feature = "extra_check"))]
     #[inline]
+    #[allow(clippy::unnecessary_wraps)]
     fn check_update(&self) -> Result<()> {
         Ok(())
     }
@@ -793,6 +778,7 @@ impl Statement<'_> {
 
     #[cfg(not(feature = "extra_check"))]
     #[inline]
+    #[allow(clippy::unnecessary_wraps)]
     pub(crate) fn check_no_tail(&self) -> Result<()> {
         Ok(())
     }