test_firmware: use str_true_false() helper

Replace ternary (condition ? "true" : "false") expressions with the
str_true_false() helper from string_choices.h. This improves readability
by replacing the three-operand ternary with a single function call,
ensures consistent string output, and allows potential string
deduplication by the linker, resulting in a slightly smaller binary.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Kuan-Wei Chiu <[e-mail]>
Cc: Kuan-Wei Chiu <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

lib/test_firmware.c

···
 #include <linux/kthread.h>
 #include <linux/vmalloc.h>
 #include <linux/efi_embedded_fw.h>
+#include <linux/string_choices.h>
 
 MODULE_IMPORT_NS("TEST_FIRMWARE");
 
···
 			"FW_ACTION_NOUEVENT");
 	len += scnprintf(buf + len, PAGE_SIZE - len,
 			"into_buf:\t\t%s\n",
-			test_fw_config->into_buf ? "true" : "false");
+			str_true_false(test_fw_config->into_buf));
 	len += scnprintf(buf + len, PAGE_SIZE - len,
 			"buf_size:\t%zu\n", test_fw_config->buf_size);
 	len += scnprintf(buf + len, PAGE_SIZE - len,
 			"file_offset:\t%zu\n", test_fw_config->file_offset);
 	len += scnprintf(buf + len, PAGE_SIZE - len,
 			"partial:\t\t%s\n",
-			test_fw_config->partial ? "true" : "false");
+			str_true_false(test_fw_config->partial));
 	len += scnprintf(buf + len, PAGE_SIZE - len,
 			"sync_direct:\t\t%s\n",
-			test_fw_config->sync_direct ? "true" : "false");
+			str_true_false(test_fw_config->sync_direct));
 	len += scnprintf(buf + len, PAGE_SIZE - len,
 			"read_fw_idx:\t%u\n", test_fw_config->read_fw_idx);
 	if (test_fw_config->upload_name)