Added missing error handling in deflate stream test

Signed-off-by: AeroStun <24841307+AeroStun@users.noreply.github.com>

test/beast/zlib/deflate_stream.cpp

@@ -112,6 +112,8 @@ public:
         z_stream zs;
         memset(&zs, 0, sizeof(zs));
         result = inflateInit2(&zs, -15);
+        if(result != Z_OK)
+            throw std::logic_error{"inflateInit2 failed"};
         try
         {
             zs.next_in = (Bytef*)in.data();