kunit: Don't use a managed alloc in is_literal()

There is no need to use a test-managed alloc in is_literal().
The function frees the temporary buffer before returning.

This removes the only use of the test and gfp members of
struct string_stream outside of the string_stream implementation.
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Reviewed-by: David Gow <davidgow@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

lib/kunit/assert.c

@@ -89,8 +89,7 @@ void kunit_ptr_not_err_assert_format(const struct kunit_assert *assert,
 EXPORT_SYMBOL_GPL(kunit_ptr_not_err_assert_format);
 
 /* Checks if `text` is a literal representing `value`, e.g. "5" and 5 */
-static bool is_literal(struct kunit *test, const char *text, long long value,
-		       gfp_t gfp)
+static bool is_literal(const char *text, long long value)
 {
 	char *buffer;
 	int len;
@@ -100,14 +99,15 @@ static bool is_literal(struct kunit *test, const char *text, long long value,
 	if (strlen(text) != len)
 		return false;
 
-	buffer = kunit_kmalloc(test, len+1, gfp);
+	buffer = kmalloc(len+1, GFP_KERNEL);
 	if (!buffer)
 		return false;
 
 	snprintf(buffer, len+1, "%lld", value);
 	ret = strncmp(buffer, text, len) == 0;
 
-	kunit_kfree(test, buffer);
+	kfree(buffer);
+
 	return ret;
 }
 
@@ -125,14 +125,12 @@ void kunit_binary_assert_format(const struct kunit_assert *assert,
 			  binary_assert->text->left_text,
 			  binary_assert->text->operation,
 			  binary_assert->text->right_text);
-	if (!is_literal(stream->test, binary_assert->text->left_text,
-			binary_assert->left_value, stream->gfp))
+	if (!is_literal(binary_assert->text->left_text, binary_assert->left_value))
 		string_stream_add(stream, KUNIT_SUBSUBTEST_INDENT "%s == %lld (0x%llx)\n",
 				  binary_assert->text->left_text,
 				  binary_assert->left_value,
 				  binary_assert->left_value);
-	if (!is_literal(stream->test, binary_assert->text->right_text,
-			binary_assert->right_value, stream->gfp))
+	if (!is_literal(binary_assert->text->right_text, binary_assert->right_value))
 		string_stream_add(stream, KUNIT_SUBSUBTEST_INDENT "%s == %lld (0x%llx)",
 				  binary_assert->text->right_text,
 				  binary_assert->right_value,