Streams: Consistent behaviour when reading from stream with error.

The streaming operator doesn't short-circuit, consider the following
snippet:

    void foo(InputStream& stream) {
        int a, b;
        stream >> a >> b;
    }

If the first read fails, the second is called regardless. It should be
well defined what happens in this case: nothing.

Libraries/LibCompress/Deflate.cpp

@@ -189,8 +189,8 @@ DeflateDecompressor::~DeflateDecompressor()
 
 size_t DeflateDecompressor::read(Bytes bytes)
 {
-    // FIXME: There are surely a ton of bugs because we don't check for read errors
-    //        very often.
+    if (has_any_error())
+        return 0;
 
     if (m_state == State::Idle) {
         if (m_read_final_bock)