docs: kdoc_parser: don't mangle with function defines

Mangling with #defines is not nice, as we may end removing
the macro names, preventing several macros from being properly
documented.

Also, on defines, we have something like:

	#define foo(a1, a2, a3, ...)			 \
		/* some real implementation */

The prototype part (first line on this example) won't contain
any macros, so no need to apply any regexes on it.

With that, move the apply_transforms() logic to ensure that
it will be called only on functions.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <8f9854c8ca1c794b6a3fe418f7adbc32aa68b432.1772469446.git.mchehab+huawei@kernel.org>

tools/lib/python/kdoc/kdoc_parser.py

@@ -163,7 +163,7 @@ struct_nested_prefixes = [
 #
 # Transforms for function prototypes
 #
-function_xforms  = [
+function_xforms = [
     (KernRe(r"^static +"), ""),
     (KernRe(r"^extern +"), ""),
     (KernRe(r"^asmlinkage +"), ""),
@@ -1066,10 +1066,7 @@ class KernelDoc:
         found = func_macro = False
         return_type = ''
         decl_type = 'function'
-        #
-        # Apply the initial transformations.
-        #
-        prototype = apply_transforms(function_xforms, prototype)
+
         #
         # If we have a macro, remove the "#define" at the front.
         #
@@ -1088,6 +1085,11 @@ class KernelDoc:
                 declaration_name = r.group(1)
                 func_macro = True
                 found = True
+        else:
+            #
+            # Apply the initial transformations.
+            #
+            prototype = apply_transforms(function_xforms, prototype)
 
         # Yes, this truly is vile.  We are looking for:
         # 1. Return type (may be nothing if we're looking at a macro)