docs: kdoc: remove the brcount floor in process_proto_type()

Putting the floor under brcount does not change the output in any way, just
remove it.

Change the termination test from ==0 to <=0 to prevent infinite loops in
case somebody does something truly wacko in the code.

Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Tested-by: Akira Yokosawa <akiyks@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250703184403.274408-4-corbet@lwn.net

Author: Jonathan Corbet

scripts/lib/kdoc/kdoc_parser.py

@@ -1609,9 +1609,7 @@ def process_proto_type(self, ln, line):
                 self.entry.brcount += r.group(2).count('{')
                 self.entry.brcount -= r.group(2).count('}')
 
-                self.entry.brcount = max(self.entry.brcount, 0)
-
-                if r.group(2) == ';' and self.entry.brcount == 0:
+                if r.group(2) == ';' and self.entry.brcount <= 0:
                     self.dump_declaration(ln, self.entry.prototype)
                     self.reset_state(ln)
                     break