Fix uninitialized variables in sdb

doc/fortunes

@@ -214,3 +214,4 @@ I script in C, because fuck you
 EXPLICIT CONTENT
 bindings are mostly powered by tears
 In Soviet Russia, Radare have documentation
+Initial frame selected; you cannot go up.

shlr/sdb/src/ns.c

@@ -40,12 +40,12 @@ static SdbNs *sdb_ns_new (Sdb *s, const char *name, ut32 hash) {
 		memcpy (dir, s->dir, dir_len);
 		memcpy (dir+dir_len, ".", 1);
 		memcpy (dir+dir_len+1, name, name_len);
-	}
+	} else dir[0] = 0;
 	ns = malloc (sizeof (SdbNs));
 	if (!ns) return NULL;
 	ns->hash = hash;
 	ns->name = name? strdup (name): NULL;
-	ns->sdb = sdb_new (dir, name, 0);
+	ns->sdb = sdb_new (dir, ns->name, 0);
 	return ns;
 }
 
@@ -55,6 +55,8 @@ SDB_API int sdb_ns_set (Sdb *s, const char *name, Sdb *r) {
 	ut32 hash = sdb_hashstr (name);
 	ls_foreach (s->ns, it, ns) {
 		if (ns->hash == hash) {
+			// implicit?
+			//sdb_free (ns->sdb);
 			ns->sdb = r;
 			return 1;
 		}
@@ -72,7 +74,10 @@ SDB_API int sdb_ns_set (Sdb *s, const char *name, Sdb *r) {
 SDB_API Sdb *sdb_ns(Sdb *s, const char *name) {
 	SdbNs *ns;
 	SdbListIter *it;
-	ut32 hash = sdb_hashstr (name);
+	ut32 hash;
+	if (!name || !*name)
+		return NULL;
+	hash = sdb_hashstr (name);
 	ls_foreach (s->ns, it, ns) {
 		if (ns->hash == hash)
 			return ns->sdb;

shlr/sdb/src/sdb.c

@@ -26,6 +26,7 @@ SDB_API void sdb_global_hook(SdbHook hook, void *user) {
 SDB_API Sdb* sdb_new (const char *path, const char *name, int lock) {
         struct stat st = {0};
 	Sdb* s = R_NEW (Sdb);
+	if (!s) return NULL;
 	if (name && *name) {
 		if (path && *path) {
 			int plen = strlen (path);
@@ -58,6 +59,7 @@ SDB_API Sdb* sdb_new (const char *path, const char *name, int lock) {
 	s->fdump = -1;
 	s->ndump = NULL;
 	s->ns = ls_new (); // TODO: should be NULL
+	s->ns_lock = 0;
 	if (!s->ns) goto fail;
 	s->hooks = NULL;
 	s->ht = ht_new ((SdbListFree)sdb_kv_free);