index tests: add eol to avoid compiler warning

tests/index/addall.c

@@ -443,4 +443,4 @@ void test_index_addall__removes_deleted_conflicted_files(void)
 	git_annotated_commit_free(annotated);
 	git_reference_free(ref);
 	git_index_free(index);
-}
\ No newline at end of file
+}