isisd: remove superfluous checks after XMALLOC etc.

Signed-off-by: Christian Franke <chris@opensourcerouting.org>
diff --git a/isisd/isis_lsp.c b/isisd/isis_lsp.c
index 0470c5b..8f7fc0a 100644
--- a/isisd/isis_lsp.c
+++ b/isisd/isis_lsp.c
@@ -581,12 +581,7 @@
   struct isis_lsp *lsp;
 
   lsp = XCALLOC (MTYPE_ISIS_LSP, sizeof (struct isis_lsp));
-  if (!lsp)
-    {
-      /* FIXME: set lspdbol bit */
-      zlog_warn ("lsp_new(): out of memory");
-      return NULL;
-    }
+
   /* FIXME: Should be minimal mtu? */
   lsp->pdu = stream_new (1500);
   if (LSP_FRAGMENT (lsp_id) == 0)