checkseapp: declare internal function as static

Change-Id: Ic4dc59650ca849b950cb145fedafdf4fc250f009
Signed-off-by: William Roberts <william.c.roberts@intel.com>
diff --git a/tools/check_seapp.c b/tools/check_seapp.c
index 5a03b7f..84e2853 100644
--- a/tools/check_seapp.c
+++ b/tools/check_seapp.c
@@ -305,7 +305,7 @@
  * 	statically to this executable and LINK_SEPOL_STATIC is not
  * 	defined.
  */
-int check_type(sepol_policydb_t *db, char *type) {
+static int check_type(sepol_policydb_t *db, char *type) {
 
 	int rc = 1;
 #if defined(LINK_SEPOL_STATIC)