Fix RawStatement#clear_bindings

src/cache.rs

@@ -153,7 +153,7 @@ impl StatementCache {
     }
 
     // Return a statement to the cache.
-    fn cache_stmt(&self, stmt: RawStatement) {
+    fn cache_stmt(&self, mut stmt: RawStatement) {
         if stmt.is_null() {
             return;
         }

src/raw_statement.rs

@@ -169,7 +169,7 @@ impl RawStatement {
     }
 
     #[inline]
-    pub fn clear_bindings(&self) {
+    pub fn clear_bindings(&mut self) {
         unsafe {
             ffi::sqlite3_clear_bindings(self.ptr);
         } // rc is always SQLITE_OK