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[ Upstream commit2790143f09] As the devm_kcalloc may return NULL pointer, it should be better to add check for the return value, as same as the others. Fixes:7f46c8b3a5("NTB: ntb_tool: Add full multi-port NTB API support") Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn> Reviewed-by: Serge Semin <fancer.lancer@gmail.com> Reviewed-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Jon Mason <jdmason@kudzu.us> Signed-off-by: Sasha Levin <sashal@kernel.org>