diag: Initialize peripheral mask properly before log switch

Prevent the possibility of passing invalid peripheral mask value
as parameter to switch logging function by initializing peripheral
mask.

Change-Id: Ied6e33febe9824f69c68ee191d659041ad79d6d8
Signed-off-by: Manoj Prabhu B <[email protected]>

drivers/char/diag/diagchar_core.c

@@ -451,7 +451,7 @@ static void diag_close_logging_process(const int pid)
 	int i, j;
 	int session_mask = 0;
 	int device_mask = 0;
-	uint32_t p_mask;
+	uint32_t p_mask = 0;
 	struct diag_md_session_t *session_info = NULL;
 	struct diag_logging_mode_param_t params;