Fix up iOS hardware test case for SE-0054.

Author: cwillmor

test/1_stdlib/AssetsLibrary.swift

@@ -9,8 +9,8 @@ import AssetsLibrary
 
 let library = ALAssetsLibrary()
 library.enumerateGroupsWithTypes(ALAssetsGroupAll,
-  usingBlock: {(group: ALAssetsGroup!, stop: UnsafeMutablePointer<ObjCBool>!) -> Void in
+  usingBlock: {(group: ALAssetsGroup?, stop: UnsafeMutablePointer<ObjCBool>?) -> Void in
                 print("Swift usingBlock")},
-  failureBlock: {(error: NSError!) -> Void in
+  failureBlock: {(error: NSError?) -> Void in
                   print("Swift failureBlock")})
 

test/1_stdlib/Dispatch.swift

@@ -49,7 +49,7 @@ if #available(OSX 10.10, iOS 8.0, *) {
   DispatchAPI.test("dispatch_block_t identity") {
     let block = dispatch_block_create(DISPATCH_BLOCK_INHERIT_QOS_CLASS) {
       _ = 1
-    }!
+    }
 
     dispatch_async(dispatch_get_main_queue(), block)
     // This will trap if the block's pointer identity is not preserved.
@@ -61,7 +61,7 @@ if #available(OSX 10.10, iOS 8.0, *) {
 
     let block = dispatch_block_create(dispatch_block_flags_t(0)) {
       counter += 1
-    }!
+    }
     block()
     expectEqual(1, counter)