[dhowells-fs:crypto-krb5 23/33] net/rxrpc/output.c:918:6: warning: variable 'serial' is used uninitialized whenever 'if' condition is true

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git crypto-krb5
head:   3108d67c535aa3ea00a95b1daf8efdc15bb074b4
commit: 097df55e65b4cf8449dd5ae95fb43e55220e0c8d [23/33] rxrpc: Pass CHALLENGE packets to the call for recvmsg() to respond to
config: x86_64-buildonly-randconfig-005-20250131 (https://download.01.org/0day-ci/archive/20250201/202502010148.H1FR0nxe-lkp@intel.com/config)
compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250201/202502010148.H1FR0nxe-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202502010148.H1FR0nxe-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> net/rxrpc/output.c:918:6: warning: variable 'serial' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
     918 |         if (ret < 0)
         |             ^~~~~~~
   net/rxrpc/output.c:951:38: note: uninitialized use occurs here
     951 |         trace_rxrpc_tx_fail(conn->debug_id, serial, ret,
         |                                             ^~~~~~
   net/rxrpc/output.c:918:2: note: remove the 'if' if its condition is always false
     918 |         if (ret < 0)
         |         ^~~~~~~~~~~~
     919 |                 goto fail;
         |                 ~~~~~~~~~
   net/rxrpc/output.c:911:12: note: initialize the variable 'serial' to silence this warning
     911 |         u32 serial;
         |                   ^
         |                    = 0
   1 warning generated.


vim +918 net/rxrpc/output.c

   899	
   900	/*
   901	 * Send a RESPONSE message.
   902	 */
   903	void rxrpc_send_response(struct rxrpc_connection *conn, struct sk_buff *response)
   904	{
   905		struct rxrpc_skb_priv *sp = rxrpc_skb(response);
   906		struct scatterlist sg[16];
   907		struct bio_vec bvec[16];
   908		struct msghdr msg;
   909		size_t len = sp->resp.len;
   910		__be32 wserial;
   911		u32 serial;
   912		int ret, nr_sg;
   913	
   914		_enter("C=%x,%x", conn->debug_id, sp->resp.challenge_serial);
   915	
   916		sg_init_table(sg, ARRAY_SIZE(sg));
   917		ret = skb_to_sgvec(response, sg, 0, len);
 > 918		if (ret < 0)

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