lib: Changes to avoid warnings during compilation

Changes to avoid warnings for enabling Werror flag in LK

Change-Id: I893ae71ef4ebd54faf1c3bed1d2080d9d733d418
diff --git a/lib/debug/debug.c b/lib/debug/debug.c
index f239bbe..e62f806 100644
--- a/lib/debug/debug.c
+++ b/lib/debug/debug.c
@@ -43,6 +43,7 @@
 __stack_chk_fail (void)
 {
 	panic("stack smashing detected.");
+	for(;;);
 }
 
 void spin(uint32_t usecs)
@@ -97,7 +98,7 @@
 	char ts_buf[13];
 	int err;
 
-	snprintf(ts_buf, sizeof(ts_buf), "[%u] ", current_time());
+	snprintf(ts_buf, sizeof(ts_buf), "[%u] ",(unsigned int)current_time());
 	dputs(ALWAYS, ts_buf);
 
 	va_list ap;