udf: simple cleanup of truncate.c

- remove one indentation level by little code reorganization
- convert "if (smth) BUG();" to "BUG_ON(smth);"
Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>

fs/udf/truncate.c

@@ -223,21 +223,17 @@ void udf_truncate_extents(struct inode *inode)
 				if (indirect_ext_len) {
 					/* We managed to free all extents in the
 					 * indirect extent - free it too */
-					if (!epos.bh)
-						BUG();
+					BUG_ON(!epos.bh);
 					udf_free_blocks(sb, inode, epos.block,
 							0, indirect_ext_len);
-				} else {
-					if (!epos.bh) {
-						iinfo->i_lenAlloc =
-								lenalloc;
+				} else if (!epos.bh) {
+					iinfo->i_lenAlloc = lenalloc;
 					mark_inode_dirty(inode);
 				} else {
 					struct allocExtDesc *aed =
 						(struct allocExtDesc *)
 						(epos.bh->b_data);
-						int len =
-						    sizeof(struct allocExtDesc);
+					int len = sizeof(struct allocExtDesc);
 
 					aed->lengthAllocDescs =
 						cpu_to_le32(lenalloc);
@@ -251,7 +247,6 @@ void udf_truncate_extents(struct inode *inode)
 					mark_buffer_dirty_inode(
 							epos.bh, inode);
 				}
-				}
 				brelse(epos.bh);
 				epos.offset = sizeof(struct allocExtDesc);
 				epos.block = eloc;
@@ -271,12 +266,10 @@ void udf_truncate_extents(struct inode *inode)
 		}
 
 		if (indirect_ext_len) {
-			if (!epos.bh)
-				BUG();
+			BUG_ON(!epos.bh);
 			udf_free_blocks(sb, inode, epos.block, 0,
 					indirect_ext_len);
-		} else {
-			if (!epos.bh) {
+		} else if (!epos.bh) {
 			iinfo->i_lenAlloc = lenalloc;
 			mark_inode_dirty(inode);
 		} else {
@@ -293,7 +286,6 @@ void udf_truncate_extents(struct inode *inode)
 					sizeof(struct allocExtDesc));
 			mark_buffer_dirty_inode(epos.bh, inode);
 		}
-		}
 	} else if (inode->i_size) {
 		if (byte_offset) {
 			kernel_long_ad extent;