char: tpm: Fix possible memory leak in tpm_bios_measurements_open()

In tpm_bios_measurements_open(), get_device() is called on the device
embedded in struct tpm_chip. In the error path, however, put_device() is
not called. This results in a reference count leak, which prevents the
device from being properly released. This commit makes sure to call
put_device() when the seq_open() call fails.

Cc: [e-mail] # +v4.18
Fixes: 9b01b5356629 ("tpm: Move shared eventlog functions to common.c")
Signed-off-by: Joe Hattori <[e-mail]>
Signed-off-by: Jarkko Sakkinen <[e-mail]>

drivers/char/tpm/eventlog/common.c

···
 	if (!err) {
 		seq = file->private_data;
 		seq->private = chip;
+	} else {
+		put_device(&chip->dev);
 	}
 
 	return err;