ext4: fsmap: fix the block/inode bitmap comment

While debugging fstest ext4/027 failure, found below comment to be wrong and
confusing. Hence fix it while we are at it.

Signed-off-by: Ritesh Harjani <[e-mail]>
Reviewed-by: Darrick J. Wong <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Theodore Ts'o <[e-mail]>

fs/ext4/fsmap.h

···
 #define EXT4_FMR_OWN_INODES	FMR_OWNER('X', 5) /* inodes */
 #define EXT4_FMR_OWN_GDT	FMR_OWNER('f', 1) /* group descriptors */
 #define EXT4_FMR_OWN_RESV_GDT	FMR_OWNER('f', 2) /* reserved gdt blocks */
-#define EXT4_FMR_OWN_BLKBM	FMR_OWNER('f', 3) /* inode bitmap */
-#define EXT4_FMR_OWN_INOBM	FMR_OWNER('f', 4) /* block bitmap */
+#define EXT4_FMR_OWN_BLKBM	FMR_OWNER('f', 3) /* block bitmap */
+#define EXT4_FMR_OWN_INOBM	FMR_OWNER('f', 4) /* inode bitmap */
 
 #endif /* __EXT4_FSMAP_H__ */