dmaengine: ptdma: Move variable condition check to the first place and remove redundancy

The variable is dereferenced without first checking if it's null, leading
to the following warning: 'Variable

dmaengine: ptdma: Move variable condition check to the first place and remove redundancy

The variable is dereferenced without first checking if it's null, leading
to the following warning: 'Variable dereferenced before check: desc.'

drivers/dma/amd/ptdma/ptdma-dmaengine.c: pt_cmd_callback_work()
warn: variable dereferenced before check 'desc'

Therefore, move the condition check for the 'desc' variable to the first
place and remove the redundant extra condition check.

Reported-by: Dan Carpenter <[email protected]>
Closes: https://lore.kernel.org/all/[email protected]/
Fixes: 656543989457 ("dmaengine: ptdma: Utilize the AE4DMA engine's multi-queue functionality")
Signed-off-by: Basavaraj Natikar <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

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