Fixes another compile error when warnings are set

Or it may be just for arm, not sure which setting is triggering the
compile error.

BUG=none
TEST=none
R=viettrungluu@chromium.org

Review URL: https://codereview.chromium.org/355263002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@282196 0039d316-1c4b-4281-b951-d872f2087c98

mojo/examples/wget/wget.cc

@@ -93,7 +93,10 @@ class WGetApp : public ApplicationDelegate, public URLLoaderClient {
              MOJO_HANDLE_SIGNAL_READABLE,
              MOJO_DEADLINE_INDEFINITE);
       } else if (result == MOJO_RESULT_OK) {
-        fwrite(buf, num_bytes, 1, stdout);
+        if (fwrite(buf, num_bytes, 1, stdout) != num_bytes) {
+          printf("\nUnexpected error writing to file\n");
+          break;
+        }
       } else {
         break;
       }