*: 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/clint.py

@@ -2515,7 +2515,8 @@ def CheckSpacing(filename, clean_lines, linenum, nesting_state, error):
               'after the hash')
 
     cast_line = re.sub(r'^# *define +\w+\([^)]*\)', '', line)
-    match = Search(r'\((?:const )?(?:struct )?[a-zA-Z_]\w*(?: *\*(?:const)?)*\)'
+    match = Search(r'(?<!\bkvec_t)'
+                   r'\((?:const )?(?:struct )?[a-zA-Z_]\w*(?: *\*(?:const)?)*\)'
                    r' +'
                    r'-?(?:\*+|&)?(?:\w+|\+\+|--|\()', cast_line)
     if match and line[0] == ' ':