clint: Enable check for { positioned at the start of the line correctly

For some reason that was incorrectly hidden by “file is *not* \*.c or \*.h file” 
check.

src/clint.py

@@ -2560,8 +2560,7 @@ def CheckBraces(filename, clean_lines, linenum, error):
 
     line = clean_lines.elided[linenum]        # get rid of comments and strings
 
-    if not (filename.endswith('.c') or filename.endswith('.h')):
-        if Match(r'\s*{\s*$', line):
+    if Match(r'\s+{\s*$', line):
         # We allow an open brace to start a line in the case where someone
         # is using braces in a block to explicitly create a new scope, which
         # is commonly used to control the lifetime of stack-allocated