drivers/block/nvme-core.c: fix build with gcc-4.4.4

gcc-4.4.4 (and possibly other versions) fail the compile when initializers
are used with anonymous unions.  Work around this.

drivers/block/nvme-core.c: In function 'nvme_identify_ctrl':
drivers/block/nvme-core.c:1163: error: unknown field 'identify' specified in initializer
drivers/block/nvme-core.c:1163: warning: missing braces around initializer
drivers/block/nvme-core.c:1163: warning: (near initialization for 'c.<anonymous>')
drivers/block/nvme-core.c:1164: error: unknown field 'identify' specified in initializer
drivers/block/nvme-core.c:1164: warning: excess elements in struct initializer
drivers/block/nvme-core.c:1164: warning: (near initialization for 'c')
...

This patch has no effect on text size with gcc-4.8.2.

Fixes: d29ec82 ("nvme: submit internal commands through the block layer")
Cc: Christoph Hellwig <hch@lst.de>
Cc: Jens Axboe <axboe@fb.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <axboe@fb.com>

drivers/block/nvme-core.c

@@ -1171,12 +1171,13 @@ static int adapter_delete_sq(struct nvme_dev *dev, u16 sqid)
 
 int nvme_identify_ctrl(struct nvme_dev *dev, struct nvme_id_ctrl **id)
 {
-	struct nvme_command c = {
-		.identify.opcode = nvme_admin_identify,
-		.identify.cns = cpu_to_le32(1),
-	};
+	struct nvme_command c = { };
 	int error;
 
+	/* gcc-4.4.4 (at least) has issues with initializers and anon unions */
+	c.identify.opcode = nvme_admin_identify;
+	c.identify.cns = cpu_to_le32(1);
+
 	*id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL);
 	if (!*id)
 		return -ENOMEM;
@@ -1191,12 +1192,13 @@ int nvme_identify_ctrl(struct nvme_dev *dev, struct nvme_id_ctrl **id)
 int nvme_identify_ns(struct nvme_dev *dev, unsigned nsid,
 		struct nvme_id_ns **id)
 {
-	struct nvme_command c = {
-		.identify.opcode = nvme_admin_identify,
-		.identify.nsid = cpu_to_le32(nsid),
-	};
+	struct nvme_command c = { };
 	int error;
 
+	/* gcc-4.4.4 (at least) has issues with initializers and anon unions */
+	c.identify.opcode = nvme_admin_identify,
+	c.identify.nsid = cpu_to_le32(nsid),
+
 	*id = kmalloc(sizeof(struct nvme_id_ns), GFP_KERNEL);
 	if (!*id)
 		return -ENOMEM;
@@ -1240,14 +1242,14 @@ int nvme_set_features(struct nvme_dev *dev, unsigned fid, unsigned dword11,
 
 int nvme_get_log_page(struct nvme_dev *dev, struct nvme_smart_log **log)
 {
-	struct nvme_command c = {
-		.common.opcode = nvme_admin_get_log_page,
-		.common.nsid = cpu_to_le32(0xFFFFFFFF),
-		.common.cdw10[0] = cpu_to_le32(
+	struct nvme_command c = { };
+	int error;
+
+	c.common.opcode = nvme_admin_get_log_page,
+	c.common.nsid = cpu_to_le32(0xFFFFFFFF),
+	c.common.cdw10[0] = cpu_to_le32(
 			(((sizeof(struct nvme_smart_log) / 4) - 1) << 16) |
 			 NVME_LOG_SMART),
-	};
-	int error;
 
 	*log = kmalloc(sizeof(struct nvme_smart_log), GFP_KERNEL);
 	if (!*log)