scsi: elx: efct: Eliminate unnecessary boolean check in efct_hw_command_cancel()

clang warns:

drivers/scsi/elx/efct/efct_hw.c:1523:17: warning: address of array
'ctx->buf' will always evaluate to 'true' [-Wpointer-bool-conversion]
                              (!ctx->buf ? U32_MAX : *((u32 *)ctx->buf)));
                               ~~~~~~^~~

buf is an array in the middle of a struct so deferencing it is not a
problem as long as ctx is not NULL. Eliminate the check, which fixes the
warning.

Link: https://github.com/ClangBuiltLinux/linux/issues/1398
Link: https://lore.kernel.org/r/20210617063123.21239-1-nathan@kernel.org
Fixes: 580c0255 ("scsi: elx: efct: RQ buffer, memory pool allocation and deallocation APIs")
Reviewed-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/elx/efct/efct_hw.c

@@ -1519,8 +1519,7 @@ efct_hw_command_cancel(struct efct_hw *hw)
 				       struct efct_command_ctx, list_entry);
 
 		efc_log_debug(hw->os, "hung command %08x\n",
-			      !ctx ? U32_MAX :
-			      (!ctx->buf ? U32_MAX : *((u32 *)ctx->buf)));
+			      !ctx ? U32_MAX : *((u32 *)ctx->buf));
 		spin_unlock_irqrestore(&hw->cmd_lock, flags);
 		rc = efct_hw_command_process(hw, -1, mqe, SLI4_BMBX_SIZE);
 		spin_lock_irqsave(&hw->cmd_lock, flags);