indents(c): add zero_indent for #if

tests/indent/c/aligned_indent.c

@@ -5,6 +5,3 @@ void foo(int a,
 void foo(int a,
          int b
 
-
-
-

tests/indent/c/comment.c

@@ -6,6 +6,3 @@
 void foo(int *x, int y) {
     *x = y;
 }
-
-/*
- *

tests/indent/c/unfinished_comment.c

@@ -0,0 +1,2 @@
+/*
+ *

tests/indent/c_spec.lua

@@ -13,7 +13,7 @@ describe("indent C:", function()
     runner:whole_file(".", {
       expected_failures = {
         "./preproc_func.c",
-        "./label.c",
+        "./unfinished_comment.c",
       },
     })
   end)

tests/indent/cpp_spec.lua

@@ -16,7 +16,7 @@ describe("indent C++:", function()
       expected_failures = {
         -- C
         "c/preproc_func.c",
-        "c/label.c",
+        "c/unfinished_comment.c",
       },
     })
   end)