Merge branch 'rs/strbuf-remove-fix'

Code cleanup.

* rs/strbuf-remove-fix:
  strbuf: use valid pointer in strbuf_remove()

strbuf.c

@@ -187,7 +187,7 @@ void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
 
 void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
 {
-	strbuf_splice(sb, pos, len, NULL, 0);
+	strbuf_splice(sb, pos, len, "", 0);
 }
 
 void strbuf_add(struct strbuf *sb, const void *data, size_t len)