wlan: Userspace data copy fix

Use copy_to_user and copy_from_user for
copying data to/from user space.

Change-Id: I07ed5361b439f4bcd61bbf693cc17c950f5b2660
CRs-Fixed: 561022
diff --git a/CORE/HDD/inc/wlan_hdd_main.h b/CORE/HDD/inc/wlan_hdd_main.h
index 57b2ec0..e3fcca4 100644
--- a/CORE/HDD/inc/wlan_hdd_main.h
+++ b/CORE/HDD/inc/wlan_hdd_main.h
@@ -153,6 +153,7 @@
 #define MAC_ADDR_ARRAY(a) (a)[0], (a)[1], (a)[2], (a)[3], (a)[4], (a)[5]
 /** Mac Address string **/
 #define MAC_ADDRESS_STR "%02x:%02x:%02x:%02x:%02x:%02x"
+#define MAC_ADDRESS_STR_LEN 18 /* Including null terminator */
 #define MAX_GENIE_LEN 255
 
 #define WLAN_CHIP_VERSION   "WCNSS"