Remove .Result calls in async tests failing in wasm.

Author: carlossanlop

src/libraries/System.IO.Compression/tests/ZipArchive/zip_InvalidParametersAndStrangeFiles.cs

@@ -283,7 +283,7 @@ public static async Task ZipArchiveEntry_CorruptedStream_ReadMode_Read_UpToUncom
         [MemberData(nameof(Get_Booleans_Data))]
         public static async Task ZipArchiveEntry_CorruptedStream_EnsureNoExtraBytesReadOrOverWritten(bool async)
         {
-            MemoryStream stream = PopulateStream().Result;
+            MemoryStream stream = await LocalMemoryStream.ReadAppFileAsync(zfile("normal.zip"));
 
             int nameOffset = PatchDataRelativeToFileName(Encoding.ASCII.GetBytes(s_tamperedFileName), stream, 8);  // patch uncompressed size in file header
             PatchDataRelativeToFileName(Encoding.ASCII.GetBytes(s_tamperedFileName), stream, 22, nameOffset + s_tamperedFileName.Length); // patch in central directory too
@@ -314,11 +314,6 @@ public static async Task ZipArchiveEntry_CorruptedStream_EnsureNoExtraBytesReadO
             await DisposeZipArchive(async, archive);
         }
 
-        private static async Task<MemoryStream> PopulateStream()
-        {
-            return await LocalMemoryStream.ReadAppFileAsync(zfile("normal.zip"));
-        }
-
         [Theory]
         [MemberData(nameof(Get_Booleans_Data))]
         public static async Task Zip64ArchiveEntry_CorruptedStream_CopyTo_UpToUncompressedSize(bool async)