nfc: st21nfca: Drop unneeded null check in st21nfca_tx_work()

nfc: st21nfca: Drop unneeded null check in st21nfca_tx_work()

Variable 'info' is obtained via container_of() of struct work_struct, so
it cannot be NULL.  Simplify the code and solve Smatch warning:

  drivers/nfc/st21nfca/dep.c:119 st21nfca_tx_work() warn: can 'info' even be NULL?

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250104142043.116045-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>