Corrected bitfield definition

Author: Mika Leppänen

source/Security/protocols/sec_prot_keys.h

@@ -89,7 +89,7 @@ typedef struct {
     uint32_t               ptk_lifetime;              /**< PTK lifetime in seconds */
     uint8_t                gtkl;                      /**< Remote GTKL information */
     int8_t                 gtk_set_index;             /**< Index of GTK to set */
-    uint8_t                ins_gtk_hash_set: 4;       /**< Hash for inserted GTKs for a PTK set */
+    unsigned               ins_gtk_hash_set: 4;       /**< Hash for inserted GTKs for a PTK set */
     bool                   pmk_set: 1;                /**< Pairwise Master Key set */
     bool                   ptk_set: 1;                /**< Pairwise Transient Key set */
     bool                   pmk_key_replay_cnt_set: 1; /**< Pairwise Master Key replay counter set */