ext4: Make ext4_group_t be an unsigned int

Nearly all places in the ext3/4 code which uses "unsigned long" is
probably a bug, since on 32-bit systems a ulong a 32-bits, which means
we are wasting stack space on 64-bit systems.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 4794d2c..cac3617 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -74,7 +74,7 @@
 	/* If checksum is bad mark all blocks and inodes use to prevent
 	 * allocation, essentially implementing a per-group read-only flag. */
 	if (!ext4_group_desc_csum_verify(sbi, block_group, gdp)) {
-		ext4_error(sb, __func__, "Checksum bad for group %lu",
+		ext4_error(sb, __func__, "Checksum bad for group %u",
 			   block_group);
 		gdp->bg_free_blocks_count = 0;
 		gdp->bg_free_inodes_count = 0;
@@ -111,7 +111,7 @@
 	if (unlikely(!bh)) {
 		ext4_error(sb, __func__,
 			    "Cannot read inode bitmap - "
-			    "block_group = %lu, inode_bitmap = %llu",
+			    "block_group = %u, inode_bitmap = %llu",
 			    block_group, bitmap_blk);
 		return NULL;
 	}
@@ -133,7 +133,7 @@
 		put_bh(bh);
 		ext4_error(sb, __func__,
 			    "Cannot read inode bitmap - "
-			    "block_group = %lu, inode_bitmap = %llu",
+			    "block_group = %u, inode_bitmap = %llu",
 			    block_group, bitmap_blk);
 		return NULL;
 	}
@@ -690,7 +690,7 @@
 	    ino > EXT4_INODES_PER_GROUP(sb)) {
 		ext4_error(sb, __func__,
 			   "reserved inode or inode > inodes count - "
-			   "block_group = %lu, inode=%lu", group,
+			   "block_group = %u, inode=%lu", group,
 			   ino + group * EXT4_INODES_PER_GROUP(sb));
 		err = -EIO;
 		goto fail;