ksmbd: Replace one-element arrays with flexible-array members

Replace the deprecated one-element arrays with flexible-array members
in the structs filesystem_attribute_info and filesystem_device_info.

There are no binary differences after this conversion.

Link: KSPP#79
Signed-off-by: Thorsten Blum <thorsten.blum@toblux.com>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

Author: toblux

fs/smb/server/smb2pdu.c

@@ -5360,7 +5360,7 @@ static int smb2_get_info_filesystem(struct ksmbd_work *work,
 					"NTFS", PATH_MAX, conn->local_nls, 0);
 		len = len * 2;
 		info->FileSystemNameLen = cpu_to_le32(len);
-		sz = sizeof(struct filesystem_attribute_info) - 2 + len;
+		sz = sizeof(struct filesystem_attribute_info) + len;
 		rsp->OutputBufferLength = cpu_to_le32(sz);
 		break;
 	}
@@ -5386,7 +5386,7 @@ static int smb2_get_info_filesystem(struct ksmbd_work *work,
 		len = len * 2;
 		info->VolumeLabelSize = cpu_to_le32(len);
 		info->Reserved = 0;
-		sz = sizeof(struct filesystem_vol_info) - 2 + len;
+		sz = sizeof(struct filesystem_vol_info) + len;
 		rsp->OutputBufferLength = cpu_to_le32(sz);
 		break;
 	}

fs/smb/server/smb_common.h

@@ -213,7 +213,7 @@ struct filesystem_attribute_info {
 	__le32 Attributes;
 	__le32 MaxPathNameComponentLength;
 	__le32 FileSystemNameLen;
-	__le16 FileSystemName[1]; /* do not have to save this - get subset? */
+	__le16 FileSystemName[]; /* do not have to save this - get subset? */
 } __packed;
 
 struct filesystem_device_info {
@@ -226,7 +226,7 @@ struct filesystem_vol_info {
 	__le32 SerialNumber;
 	__le32 VolumeLabelSize;
 	__le16 Reserved;
-	__le16 VolumeLabel[1];
+	__le16 VolumeLabel[];
 } __packed;
 
 struct filesystem_info {