fix: swiftlint issues (#512)

Author: jbelkins

Sources/ClientRuntime/Networking/Http/HttpBody.swift

@@ -39,7 +39,6 @@ public extension HttpBody {
     }
 }
 
-
 extension HttpBody: CustomDebugStringConvertible {
     public var debugDescription: String {
         var bodyAsString: String?

Sources/ClientRuntime/Networking/Streaming/DataStreamReader.swift

@@ -45,7 +45,7 @@ public class DataStreamReader: StreamReader {
         let count = Int(maxBytes ?? availableForRead)
         var data = Data(count: count)
         withLockingClosure {
-            var bytesRead: Int? = nil
+            var bytesRead: Int?
             data.withUnsafeMutableBytes { buffer in
                 let typedBuffer = buffer.bindMemory(to: UInt8.self)
                 bytesRead = byteBuffer.read(buffer: typedBuffer)

Sources/ClientRuntime/Retries/SDKRetryer.swift

@@ -101,7 +101,8 @@ extension AwsCommonRuntimeKit.RetryStrategy {
             maxRetries: options.maxRetries,
             backOffScaleFactor: options.backOffScaleFactor,
             jitterMode: options.jitterMode.toCRTType(),
-            generateRandom: nil // we should pass in the options.generateRandom but currently it fails since the underlying closure is a c closure
+            generateRandom: nil // we should pass in the options.generateRandom but currently
+                                // it fails since the underlying closure is a c closure
         )
     }
 }