scsi: target: tcmu: Fix warning: 'page' may be used uninitialized

mainline inclusion
from mainline-v5.10-rc1
commit 8c4e0f21
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5SXLB
CVE: NA

--------------------------------

Corrects drivers/target/target_core_user.c:688:6: warning: 'page' may be
used uninitialized.

Link: https://lore.kernel.org/r/20200924001920.43594-1-john.p.donnelly@oracle.com
Fixes: 3c58f737 ("scsi: target: tcmu: Optimize use of flush_dcache_page")
Cc: Mike Christie <michael.christie@oracle.com>
Acked-by: NMike Christie <michael.christie@oracle.com>
Signed-off-by: NJohn Donnelly <john.p.donnelly@oracle.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: NWenchao Hao <haowenchao@huawei.com>
Reviewed-by: Nlijinlin <lijinlin3@huawei.com>
Signed-off-by: NYongqiang Liu <liuyongqiang13@huawei.com>

drivers/target/target_core_user.c

@@ -680,7 +680,7 @@ static void scatter_data_area(struct tcmu_dev *udev,
 	void *from, *to = NULL;
 	size_t copy_bytes, to_offset, offset;
 	struct scatterlist *sg;
-	struct page *page;
+	struct page *page = NULL;
 
 	for_each_sg(data_sg, sg, data_nents, i) {
 		int sg_remaining = sg->length;