drivers: fix up various ->llseek() implementations

Fix up a few ->llseek() implementations that won't deal with SEEK_HOLE/SEEK_DATA
properly. Make them future proof so that if we ever add new options they will
return -EINVAL. Thanks,

Signed-off-by: Josef Bacik <[e-mail]>
Signed-off-by: Al Viro <[e-mail]>

drivers/char/generic_nvram.c

···
 static loff_t nvram_llseek(struct file *file, loff_t offset, int origin)
 {
 	switch (origin) {
+	case 0:
+		break;
 	case 1:
 		offset += file->f_pos;
 		break;
 	case 2:
 		offset += nvram_len;
 		break;
+	default:
+		offset = -1;
 	}
 	if (offset < 0)
 		return -EINVAL;

drivers/char/nvram.c

···
 	case 2:
 		offset += NVRAM_BYTES;
 		break;
+	default:
+		return -EINVAL;
 	}
 
 	return (offset >= 0) ? (file->f_pos = offset) : -EINVAL;

drivers/char/ps3flash.c

···
 
 	mutex_lock(&file->f_mapping->host->i_mutex);
 	switch (origin) {
+	case 0:
+		break;
 	case 1:
 		offset += file->f_pos;
 		break;
 	case 2:
 		offset += dev->regions[dev->region_idx].size*dev->blk_size;
 		break;
+	default:
+		offset = -1;
 	}
 	if (offset < 0) {
 		res = -EINVAL;

drivers/macintosh/nvram.c

···
 static loff_t nvram_llseek(struct file *file, loff_t offset, int origin)
 {
 	switch (origin) {
+	case 0:
+		break;
 	case 1:
 		offset += file->f_pos;
 		break;
 	case 2:
 		offset += NVRAM_SIZE;
 		break;
+	default:
+		offset = -1;
 	}
 	if (offset < 0)
 		return -EINVAL;