xprtrdma: Decouple req recycling from RPC completion

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                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                        "net/sunrpc/xprtrdma/backchannel.c",
                        "net/sunrpc/xprtrdma/rpc_rdma.c",
                        "net/sunrpc/xprtrdma/transport.c",
                        "net/sunrpc/xprtrdma/verbs.c",
                        "net/sunrpc/xprtrdma/xprt_rdma.h"
                    ],
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{
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                    "vendor": "Linux",
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                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/sunrpc/xprtrdma/backchannel.c",
                        "net/sunrpc/xprtrdma/rpc_rdma.c",
                        "net/sunrpc/xprtrdma/transport.c",
                        "net/sunrpc/xprtrdma/verbs.c",
                        "net/sunrpc/xprtrdma/xprt_rdma.h"
                    ],
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                }