scanf: remove redundant debug logs

Remove `pr_debug` calls which emit information already contained in
`pr_warn` calls that occur on test failure. This reduces unhelpful test
verbosity.

Note that a `pr_debug` removed from `_check_numbers_template` appears to
have been the only guard against silent false positives, but in fact
this condition is handled in `_test`; it is only possible for `n_args`
to be `0` in `_check_numbers_template` if the test explicitly expects it
*and* `vsscanf` returns `0`, matching the expectation.

Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
Link: https://lore.kernel.org/r/20250307-scanf-kunit-convert-v9-2-b98820fa39ff@gmail.com
Signed-off-by: Kees Cook <kees@kernel.org>

Author: tamird

lib/test_scanf.c

@@ -62,10 +62,8 @@ _test(const char *file, const int line, check_fn fn, const void *check_data, con
 
 #define _check_numbers_template(arg_fmt, expect, str, fmt, n_args, ap)		\
 do {										\
-	pr_debug("\"%s\", \"%s\" ->\n", str, fmt);				\
 	for (; n_args > 0; n_args--, expect++) {				\
 		typeof(*expect) got = *va_arg(ap, typeof(expect));		\
-		pr_debug("\t" arg_fmt "\n", got);				\
 		if (got != *expect) {						\
 			pr_warn("%s:%d, vsscanf(\"%s\", \"%s\", ...) expected " arg_fmt " got " arg_fmt "\n", \
 				file, line, str, fmt, *expect, got);		\
@@ -689,7 +687,6 @@ do {										\
 	total_tests++;								\
 	len = snprintf(test_buffer, BUF_SIZE, gen_fmt, expect);			\
 	got = (fn)(test_buffer, &endp, base);					\
-	pr_debug(#fn "(\"%s\", %d) -> " gen_fmt "\n", test_buffer, base, got);	\
 	if (got != (expect)) {							\
 		fail = true;							\
 		pr_warn(#fn "(\"%s\", %d): got " gen_fmt " expected " gen_fmt "\n", \