firmware_loader: Remove unnecessary conversion to bool

Fix the following coccicheck warnings:

./tools/testing/selftests/firmware/fw_namespace.c:98:54-59: WARNING:
conversion to bool not needed here.
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Link: https://lore.kernel.org/r/1613639529-41139-1-git-send-email-jiapeng.chong@linux.alibaba.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

tools/testing/selftests/firmware/fw_namespace.c

@@ -95,7 +95,7 @@ static bool test_fw_in_ns(const char *fw_name, const char *sys_path, bool block_
 		}
 		if (block_fw_in_parent_ns)
 			umount("/lib/firmware");
-		return WEXITSTATUS(status) == EXIT_SUCCESS ? true : false;
+		return WEXITSTATUS(status) == EXIT_SUCCESS;
 	}
 
 	if (unshare(CLONE_NEWNS) != 0) {