[Bug 261455] Fix a possible Null pointer dereference in svc_dg_create()

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261455

            Bug ID: 261455
           Summary: Fix a possible Null pointer dereference in
                    svc_dg_create()
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: zhou1615@umn.edu

Created attachment 231295
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=231295&action=edit
A simple fix for this bug

In sys/rpc/svc_dg.c file, the return value of svc_xprt_alloc() is assigned to
xprt
and there is a dereference of it right after that, which would lead to NULL
pointer
dereference on failure of allocation.

Fix this bug by adding a NULL check of xprt.

This bug is found by static analyzer, please advise.

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