rpmsg: glink: Fix reuse intents memory leak issue

rpmsg: glink: Fix reuse intents memory leak issue

commit b85f6b601407347f5425c4c058d1b7871f5bf4f0 upstream.

Memory allocated for re-usable intents are not freed during channel
cleanup which causes memory leak in system.

Check and free all re-usable memory to avoid memory leak.

Fixes: 933b45da5d1d ("rpmsg: glink: Add support for TX intents")
Cc: stable@vger.kernel.org
Acked-By: Chris Lew <clew@codeaurora.org>
Tested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Arun Kumar Neelakantam <aneela@codeaurora.org>
Reported-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>