Staging: lustre: lustre: osc: Remove variable that is not very useful.

The following patch removes a variable that is not very useful using
coccinelle.
The semantic patch used was:
@@
identifier ret;
@@

-int ret = 0;
 ... when != ret
     when strict
-return ret;
+return 0;
Signed-off-by: Heena Sirwani <heenasirwani@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/osc/osc_cache.c

@@ -539,7 +539,6 @@ static int osc_extent_merge(const struct lu_env *env, struct osc_extent *cur,
 int osc_extent_release(const struct lu_env *env, struct osc_extent *ext)
 {
 	struct osc_object *obj = ext->oe_obj;
-	int rc = 0;
 
 	LASSERT(atomic_read(&ext->oe_users) > 0);
 	LASSERT(sanity_check(ext) == 0);
@@ -571,7 +570,7 @@ int osc_extent_release(const struct lu_env *env, struct osc_extent *ext)
 		osc_io_unplug_async(env, osc_cli(obj), obj);
 	}
 	osc_extent_put(env, ext);
-	return rc;
+	return 0;
 }
 
 static inline int overlapped(struct osc_extent *ex1, struct osc_extent *ex2)