[PATCH] SUNRPC: Fix integer overflow in decode_rc_list()

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

The math in "rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t)" could have an
integer overflow.  Add bounds checking on rc_list->rcl_nrefcalls to fix
that.

Fixes: 4aece6a19cf7 ("nfs41: cb_sequence xdr implementation")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
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