cifsd: remove unused nterr.c file

mainline inclusion
from mainline-5.15-rc1
commit 2efec2de
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I60T7G
CVE: NA

Reference: https://git.kernel.org/torvalds/linux/c/2efec2dee861

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

Remove unused nterr.c file.
Signed-off-by: NNamjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: NSteve French <stfrench@microsoft.com>
Signed-off-by: NJason Yan <yanaijie@huawei.com>
Signed-off-by: NZhong Jinghua <zhongjinghua@huawei.com>

fs/cifsd/nterr.h

@@ -14,13 +14,6 @@
 #ifndef _NTERR_H
 #define _NTERR_H
 
-struct nt_err_code_struct {
-	char *nt_errstr;
-	__u32 nt_errcode;
-};
-
-extern const struct nt_err_code_struct nt_errs[];
-
 /* Win32 Status codes. */
 #define NT_STATUS_MORE_ENTRIES         0x0105
 #define NT_ERROR_INVALID_PARAMETER     0x0057