fix error

Author: wickwirew

Sources/Otter/SQLiteCode.swift

@@ -125,5 +125,6 @@ public enum SQLiteCode: Int32, Error {
 
 func throwing(_ rc: Int32, connection: OpaquePointer? = nil) throws(OtterError) {
     guard rc != SQLITE_OK, let code = SQLiteCode(rawValue: rc) else { return }
+    // Memory for the error is managed by SQLite so we don't need to free it.
     throw .sqlite(code, String(cString: sqlite3_errmsg(connection)))
 }

Sources/Otter/SQLiteConnection.swift

@@ -40,7 +40,12 @@ class SQLiteConnection: @unchecked Sendable {
             return
         }
 
-        let message = error.map { String(cString: $0) }
+        var message: String?
+        if let error {
+            message = String(cString: error)
+            sqlite3_free(error)
+        }
+        
         throw .sqlite(SQLiteCode(rc), message)
     }