ipr: Fix possible error path oops during initialization

Fixes a possible oops during adapter initialization in some
memory allocation failure error paths scenarios.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Reviewed-by: Wen Xiong <wenxiong@linux.vnet.ibm.com>
Reviewed-by: Daniel Kreling <kreling@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>

drivers/scsi/ipr.c

@@ -9060,6 +9060,7 @@ static void ipr_free_cmd_blks(struct ipr_ioa_cfg *ioa_cfg)
 {
 	int i;
 
+	if (ioa_cfg->ipr_cmnd_list) {
 		for (i = 0; i < IPR_NUM_CMD_BLKS; i++) {
 			if (ioa_cfg->ipr_cmnd_list[i])
 				dma_pool_free(ioa_cfg->ipr_cmd_pool,
@@ -9068,6 +9069,7 @@ static void ipr_free_cmd_blks(struct ipr_ioa_cfg *ioa_cfg)
 
 			ioa_cfg->ipr_cmnd_list[i] = NULL;
 		}
+	}
 
 	if (ioa_cfg->ipr_cmd_pool)
 		dma_pool_destroy(ioa_cfg->ipr_cmd_pool);