line-log: simplify condition checking for merge commits

In process_ranges_arbitrary_commit() the condition deciding whether
the given commit is not a merge, i.e. that it doesn't have more than
one parent, is head-scratchingly backwards, flip it.

Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: szeder

line-log.c

@@ -1273,10 +1273,10 @@ int line_log_process_ranges_arbitrary_commit(struct rev_info *rev, struct commit
 			struct line_log_data *prange = line_log_data_copy(range);
 			add_line_range(rev, commit->parents->item, prange);
 			clear_commit_line_range(rev, commit);
-		} else if (!commit->parents || !commit->parents->next)
-			changed = process_ranges_ordinary_commit(rev, commit, range);
-		else
+		} else if (commit->parents && commit->parents->next)
 			changed = process_ranges_merge_commit(rev, commit, range);
+		else
+			changed = process_ranges_ordinary_commit(rev, commit, range);
 	}
 
 	if (!changed)