Staging: rtl8192e: rtl8192e: Remove unnecessory variable

This patch removes unnecessory variable in file ret_core.c
using coccinelle script.Semantic patch for this is as follows:

@@
identifier ret;
@@

-int ret = 0;
 ... when != ret
     when strict
-return ret;
+return 0;

Signed-off-by: Vaishali Thakkar <vthakkar1994@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>