Fixed variable set but not used static analysis warning in example.

  example.c:84:14: warning: variable ‘read’ set but not used [-Wunused-but-set-variable]
     int err, read;
  example.c:198:5: warning: Value stored to 'read' is never read [deadcode.DeadStores]
    read = PREFIX(gzfread)(uncompr, uncomprLen, 1, file);

1 files changed, 1 insertions, 1 deletions

diff --git a/test/example.c b/test/example.c
index 5736a66101..e94ee33f8b 100644
--- a/test/example.c
+++ b/test/example.c
@@ -227,7 +227,7 @@ void test_gzio(const char *fname, unsigned char *uncompr, z_size_t uncomprLen) {
         fprintf(stderr, "gzclose unexpected return when handle null\n");
         exit(1);
     }
-
+    (void)read;
 #endif
 }