scsi: mac53c94: Fix warning comparing pointer to 0

Fix the following coccicheck warning:

./drivers/scsi/mac53c94.c:470:29-30: WARNING comparing pointer to 0.
./drivers/scsi/mac53c94.c:349:12-13: WARNING comparing pointer to 0.

Link: https://lore.kernel.org/r/1615349771-81106-1-git-send-email-jiapeng.chong@linux.alibaba.com
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/mac53c94.c

@@ -346,7 +346,7 @@ static void cmd_done(struct fsc_state *state, int result)
 	struct scsi_cmnd *cmd;
 
 	cmd = state->current_req;
-	if (cmd != 0) {
+	if (cmd) {
 		cmd->result = result;
 		(*cmd->scsi_done)(cmd);
 		state->current_req = NULL;
@@ -467,12 +467,13 @@ static int mac53c94_probe(struct macio_dev *mdev, const struct of_device_id *mat
        	dma_cmd_space = kmalloc_array(host->sg_tablesize + 2,
 					     sizeof(struct dbdma_cmd),
 					     GFP_KERNEL);
-       	if (dma_cmd_space == 0) {
-       		printk(KERN_ERR "mac53c94: couldn't allocate dma "
-       		       "command space for %pOF\n", node);
+	if (!dma_cmd_space) {
+		printk(KERN_ERR "mac53c94: couldn't allocate dma "
+		       "command space for %pOF\n", node);
 		rc = -ENOMEM;
-       		goto out_free;
-       	}
+		goto out_free;
+	}
+
 	state->dma_cmds = (struct dbdma_cmd *)DBDMA_ALIGN(dma_cmd_space);
 	memset(state->dma_cmds, 0, (host->sg_tablesize + 1)
 	       * sizeof(struct dbdma_cmd));