Simplify lazy variables

No need for a closure for one-liners.

Signed-off-by: Stephen Celis <stephen@stephencelis.com>

Author: stephencelis

SQLite/Statement.swift

@@ -34,7 +34,8 @@ public final class Statement {
 
     private let database: Database
 
-    public lazy var row: Cursor = { Cursor(self) }()
+    /// A cursor pointing to the current row.
+    public lazy var row: Cursor = Cursor(self)
 
     internal init(_ database: Database, _ SQL: String) {
         self.database = database
@@ -43,11 +44,11 @@ public final class Statement {
 
     deinit { sqlite3_finalize(handle) }
 
-    public lazy var columnCount: Int = { Int(sqlite3_column_count(self.handle)) }()
+    public lazy var columnCount: Int = Int(sqlite3_column_count(self.handle))
 
-    public lazy var columnNames: [String] = {
-        (0..<Int32(self.columnCount)).map { String.fromCString(sqlite3_column_name(self.handle, $0))! }
-    }()
+    public lazy var columnNames: [String] = (0..<Int32(self.columnCount)).map {
+        String.fromCString(sqlite3_column_name(self.handle, $0))!
+    }
 
     // MARK: - Binding