Fix clippy warnings (#959)

Fix clippy warnings

src/backup.rs

@@ -203,8 +203,8 @@ impl Backup<'_, '_> {
         to: &'b mut Connection,
         to_name: DatabaseName<'_>,
     ) -> Result<Backup<'a, 'b>> {
-        let to_name = to_name.to_cstring()?;
-        let from_name = from_name.to_cstring()?;
+        let to_name = to_name.as_cstring()?;
+        let from_name = from_name.as_cstring()?;
 
         let to_db = to.db.borrow_mut().db;
 

src/blob/mod.rs

@@ -225,7 +225,7 @@ impl Connection {
     ) -> Result<Blob<'a>> {
         let mut c = self.db.borrow_mut();
         let mut blob = ptr::null_mut();
-        let db = db.to_cstring()?;
+        let db = db.as_cstring()?;
         let table = super::str_to_cstring(table)?;
         let column = super::str_to_cstring(column)?;
         let rc = unsafe {

src/busy.rs

@@ -169,7 +169,7 @@ mod test {
         let _ = db2
             .query_row("PRAGMA schema_version", [], |row| row.get::<_, i32>(0))
             .expect("unexpected error");
-        assert_eq!(CALLED.load(Ordering::Relaxed), true);
+        assert!(CALLED.load(Ordering::Relaxed));
 
         child.join().unwrap();
     }

src/functions.rs

@@ -883,7 +883,7 @@ mod test {
         let result: Result<bool> =
             db.query_row("SELECT regexp('l.s[aeiouy]', 'lisa')", [], |r| r.get(0));
 
-        assert_eq!(true, result?);
+        assert!(result?);
 
         let result: Result<i64> = db.query_row(
             "SELECT COUNT(*) FROM foo WHERE regexp('l.s[aeiouy]', x) == 1",

src/lib.rs

@@ -310,7 +310,7 @@ pub const TEMP_DB: DatabaseName<'static> = DatabaseName::Temp;
 ))]
 impl DatabaseName<'_> {
     #[inline]
-    fn to_cstring(&self) -> Result<util::SmallCString> {
+    fn as_cstring(&self) -> Result<util::SmallCString> {
         use self::DatabaseName::{Attached, Main, Temp};
         match *self {
             Main => str_to_cstring("main"),
@@ -1016,7 +1016,7 @@ impl InterruptHandle {
 
 #[cfg(feature = "modern_sqlite")] // 3.7.10
 unsafe fn db_filename(db: *mut ffi::sqlite3) -> Option<PathBuf> {
-    let db_name = DatabaseName::Main.to_cstring().unwrap();
+    let db_name = DatabaseName::Main.as_cstring().unwrap();
     let db_filename = ffi::sqlite3_db_filename(db, db_name.as_ptr());
     if db_filename.is_null() {
         None

src/session.rs

@@ -40,7 +40,7 @@ impl Session<'_> {
         db: &'conn Connection,
         name: DatabaseName<'_>,
     ) -> Result<Session<'conn>> {
-        let name = name.to_cstring()?;
+        let name = name.as_cstring()?;
 
         let db = db.db.borrow_mut().db;
 
@@ -161,7 +161,7 @@ impl Session<'_> {
 
     /// Load the difference between tables.
     pub fn diff(&mut self, from: DatabaseName<'_>, table: &str) -> Result<()> {
-        let from = from.to_cstring()?;
+        let from = from.as_cstring()?;
         let table = str_to_cstring(table)?;
         let table = table.as_ptr();
         unsafe {