Fix lua compile error on most targets, introduced in 8d77ec8

Change-Id: I217f78a9e348a18552563c6c3b235c9aed956f54
diff --git a/apps/plugins/lua/ldebug.c b/apps/plugins/lua/ldebug.c
index 4c3fc1d..cf88246 100644
--- a/apps/plugins/lua/ldebug.c
+++ b/apps/plugins/lua/ldebug.c
@@ -253,7 +253,7 @@
     case 3:
       len += f->sizelineinfo;
       f->packedlineinfo = luaM_freearray(L, f->packedlineinfo, f->sizelineinfo, unsigned char);
-      f->f->sizelineinfo = 0;
+      f->sizelineinfo = 0;
     case 2:
       len += f->sizelocvars * (sizeof(struct LocVar) + sizeof(dummy->tsv) + sizeof(struct LocVar *));
       f->locvars = luaM_freearray(L, f->locvars, f->sizelocvars, struct LocVar);