fs/ntfs3: Code formatting and refactoring

Added minor refactoring.
Added and fixed some comments.
In some places, the code has been reformatted to fit into 80 columns.
clang-format-12 was used to format code according kernel's .clang-format.

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
diff --git a/fs/ntfs3/run.c b/fs/ntfs3/run.c
index a5af71c..47612d16 100644
--- a/fs/ntfs3/run.c
+++ b/fs/ntfs3/run.c
@@ -433,9 +433,9 @@ bool run_add_entry(struct runs_tree *run, CLST vcn, CLST lcn, CLST len,
 			should_add_tail = Tovcn < r->len;
 
 			if (should_add_tail) {
-				tail_lcn = r->lcn == SPARSE_LCN
-						   ? SPARSE_LCN
-						   : (r->lcn + Tovcn);
+				tail_lcn = r->lcn == SPARSE_LCN ?
+							 SPARSE_LCN :
+							 (r->lcn + Tovcn);
 				tail_vcn = r->vcn + Tovcn;
 				tail_len = r->len - Tovcn;
 			}