exfat: fix misspellings using codespell tool

Sedat reported typos using codespell tool.

$ codespell fs/exfat/*.c | grep -v iput
fs/exfat/namei.c:293: upto ==> up to
fs/exfat/nls.c:14: tabel ==> table

$ codespell fs/exfat/*.h
fs/exfat/exfat_fs.h:133: usally ==> usually

Fix typos found by codespell.

Reported-by: Sedat Dilek <[e-mail]>
Signed-off-by: Namjae Jeon <[e-mail]>

fs/exfat/exfat_fs.h

···
 
 struct exfat_dentry_namebuf {
 	char *lfn;
-	int lfnbuf_len; /* usally MAX_UNINAME_BUF_SIZE */
+	int lfnbuf_len; /* usually MAX_UNINAME_BUF_SIZE */
 };
 
 /* unicode name structure */

fs/exfat/namei.c

···
 {
 	if (EXFAT_B_TO_DEN(i_size_read(inode)) >= MAX_EXFAT_DENTRIES) {
 		/*
-		 * exFAT spec allows a dir to grow upto 8388608(256MB)
+		 * exFAT spec allows a dir to grow up to 8388608(256MB)
 		 * dentries
 		 */
 		return -ENOSPC;

fs/exfat/nls.c

···
 #include "exfat_raw.h"
 #include "exfat_fs.h"
 
-/* Upcase tabel macro */
+/* Upcase table macro */
 #define EXFAT_NUM_UPCASE	(2918)
 #define UTBL_COUNT		(0x10000)