drivers/dma-buf: dma-buf.c: fix a typo

Signed-off-by: Sui Jingfeng <15330273260@189.cn>
Link: https://patchwork.freedesktop.org/patch/msgid/20220402134413.1705246-1-15330273260@189.cnReviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>

drivers/dma-buf/dma-buf.c

@@ -443,7 +443,7 @@ static struct file *dma_buf_getfile(struct dma_buf *dmabuf, int flags)
  *    as a file descriptor by calling dma_buf_fd().
  *
  * 2. Userspace passes this file-descriptors to all drivers it wants this buffer
- *    to share with: First the filedescriptor is converted to a &dma_buf using
+ *    to share with: First the file descriptor is converted to a &dma_buf using
  *    dma_buf_get(). Then the buffer is attached to the device using
  *    dma_buf_attach().
  *