kbuild: uapi: upgrade warning on asm/types.h inclusion to error

No usages of '#include <asm/types.h> in the UAPI headers exist anymore.

Make sure it stays this way.

Add a semicolon to the end of the previous printf call to keep the
syntax valid.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Nicolas Schier <nsc@kernel.org>
Link: https://lore.kernel.org/r/20250813-kbuild-hdrtest-fixes-v2-3-8a7921ca3a03@linutronix.de
Signed-off-by: Nathan Chancellor <nathan@kernel.org>

Author: t-8ch

usr/include/headers_check.pl

@@ -98,9 +98,8 @@ sub check_asm_types
 	if ($line =~ m/^\s*#\s*include\s+<asm\/types.h>/) {
 		$linux_asm_types = 1;
 		printf STDERR "$filename:$lineno: " .
-		"include of <linux/types.h> is preferred over <asm/types.h>\n"
-		# Warn until headers are all fixed
-		#$ret = 1;
+		"include of <linux/types.h> is preferred over <asm/types.h>\n";
+		$ret = 1;
 	}
 }