staging: r8188eu: exit straight away if we have no pspoll frame
validate_recv_ctrl_frame wraps nearly all of its code into a large if (pspoll) { ... } clause. Revert this condition and exit if the incoming frame is not a pspoll frame. Signed-off-by: Martin Kaiser <martin@kaiser.cx> Link: https://lore.kernel.org/r/20220403164526.357371-4-martin@kaiser.cxSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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