Fix uninit variable in slab reclaim test

Gcc version 4.7.0 reports the delta.tv_sec in the slab reclaim test
as potentially unitialized.  In practice this will never occur but
to keep gcc happy we initialize the variable to zero.

Signed-off-by: Brian Behlendorf <behlendo@fedora-17-amd64.(none)>

module/splat/splat-kmem.c

@@ -1135,7 +1135,7 @@ splat_kmem_test13(struct file *file, void *arg)
 	kmem_cache_data_t *kcd;
 	dummy_page_t *dp;
 	struct list_head list;
-	struct timespec start, delta;
+	struct timespec start, delta = { 0, 0 };
 	int size, count, slabs, fails = 0;
 	int i, rc = 0, max_time = 10;