emb6_sock_udp: fix typo in cppcheck suppression

pkg/emb6/contrib/sock/udp/emb6_sock_udp.c

@@ -235,7 +235,7 @@ int sock_udp_send(sock_udp_t *sock, const void *data, size_t len,
     else if (sock->sock.udp_conn->rport == 0) {
         return -ENOTCONN;
     }
-    /* cppcheck-supress nullPointerRedundantCheck
+    /* cppcheck-suppress nullPointerRedundantCheck
      * remote == NULL implies that sock != NULL (see assert at start of
      * function) * that's why it is okay in the if-statement above to check
      * sock->... without checking (sock != NULL) first => this check afterwards