Add 'static' to avoid a sparse warning

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7175 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/gdbstub.c b/gdbstub.c
index f3eb827..3c34741 100644
--- a/gdbstub.c
+++ b/gdbstub.c
@@ -334,7 +334,7 @@
 
 static gdb_syscall_complete_cb gdb_current_syscall_cb;
 
-enum {
+static enum {
     GDB_SYS_UNKNOWN,
     GDB_SYS_ENABLED,
     GDB_SYS_DISABLED,