*: Fix linter errors

Also adds one exception to linter rules:

    typedef struct {
      kvec_t(Object) stack;
    } EncodedData;

is completely valid (from the style guide point of view) code.

src/nvim/eval.c

@@ -18162,7 +18162,7 @@ void free_tv(typval_T *varp)
 
 #define TYPVAL_ENCODE_CONV_NUMBER(ignored) \
     do { \
-      (void) ignored; \
+      (void)ignored; \
       tv->vval.v_number = 0; \
       tv->v_lock = VAR_UNLOCKED; \
     } while (0)