re PR libgcj/8234 (ZipInputStream chokes when InputStream.read() returns small chunks)

Fix for PR libgcj/8234:
	* java/util/zip/natInflater.cc (reset): Reset avail_in.
	* java/util/zip/natDeflater.cc (reset): Reset avail_in.

From-SVN: r58205

libjava/java/util/zip/natDeflater.cc

@@ -124,6 +124,7 @@ java::util::zip::Deflater::reset ()
   z_streamp s = (z_streamp) zstream;
   // Just ignore errors.
   deflateReset (s);
+  s->avail_in = 0;
   flush_flag = 0;
   is_finished = false;
 }

libjava/java/util/zip/natInflater.cc

@@ -149,6 +149,7 @@ java::util::zip::Inflater::reset ()
   z_streamp s = (z_streamp) zstream;
   // Just ignore errors.
   inflateReset (s);
+  s->avail_in = 0;
   is_finished = false;
   dict_needed = false;
 }