f2fs: super: constify fscrypt_operations structure

Declare fscrypt_operations structure as const as it is only stored in
the s_cop field of a super_block structure. This field is of type const,
so fscrypt_operations structure having this property can be made const
too.

File size before: fs/f2fs/super.o
   text	   data	    bss	    dec	    hex	filename
  54131	  31355	    184	  85670	  14ea6	fs/f2fs/super.o

File size after: fs/f2fs/super.o
   text	   data	    bss	    dec	    hex	filename
  54227	  31259	    184	  85670	  14ea6	fs/f2fs/super.o
Signed-off-by: NBhumika Goyal <bhumirks@gmail.com>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/super.c

@@ -1209,7 +1209,7 @@ static unsigned f2fs_max_namelen(struct inode *inode)
 			inode->i_sb->s_blocksize : F2FS_NAME_LEN;
 }
 
-static struct fscrypt_operations f2fs_cryptops = {
+static const struct fscrypt_operations f2fs_cryptops = {
 	.get_context	= f2fs_get_context,
 	.key_prefix	= f2fs_key_prefix,
 	.set_context	= f2fs_set_context,
@@ -1218,7 +1218,7 @@ static struct fscrypt_operations f2fs_cryptops = {
 	.max_namelen	= f2fs_max_namelen,
 };
 #else
-static struct fscrypt_operations f2fs_cryptops = {
+static const struct fscrypt_operations f2fs_cryptops = {
 	.is_encrypted	= f2fs_encrypted_inode,
 };
 #endif