qcacld-3.0: Increase roam failure reason buffer size

Currently the roam failure reason string size is 40 bytes.
Change this to 50 bytes to avoid truncation in some failure
cases.

Change-Id: I6c90e31fc792078354e98c7a5c61ffd5583469c3
CRs-Fixed: 2637901

components/mlme/dispatcher/inc/wlan_mlme_public_struct.h

@@ -44,7 +44,7 @@
 /* Roam debugging related macro defines */
 #define MAX_ROAM_DEBUG_BUF_SIZE    250
 #define MAX_ROAM_EVENTS_SUPPORTED  5
-#define ROAM_FAILURE_BUF_SIZE      40
+#define ROAM_FAILURE_BUF_SIZE      50
 #define TIME_STRING_LEN            24
 
 #define ROAM_CHANNEL_BUF_SIZE      300