check_seapp: cleanup warning caught by clang tidy / static analyzer.

check_seapp.c:993:6: warning: Passed-by-value struct argument contains
uninitialized data (e.g., field: 'data')

Bug: 26936282
Test: WITH_TIDY=1 WITH_STATIC_ANALYZER=1 mm
Change-Id: I3fc2ca8f862356628864f2a37b8d39222c8d658a

tools/check_seapp.c

@@ -987,6 +987,7 @@ static void rule_add(rule_map *rm) {
 	list *list_to_addto;
 
 	e.key = rm->key;
+	e.data = NULL;
 
 	log_info("Searching for key: %s\n", e.key);
 	/* Check to see if it has already been added*/