video: Fix typo in drivers/video

Correct spelling typo in debug messages and comments
within drivers/video.

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/video/aty/radeon_base.c b/drivers/video/aty/radeon_base.c
index ce1506b..9e279ee 100644
--- a/drivers/video/aty/radeon_base.c
+++ b/drivers/video/aty/radeon_base.c
@@ -2018,7 +2018,7 @@
           if ((rinfo->family == CHIP_FAMILY_RS100) ||
               (rinfo->family == CHIP_FAMILY_RS200)) {
              /* This is to workaround the asic bug for RMX, some versions
-                of BIOS dosen't have this register initialized correctly.
+                of BIOS doesn't have this register initialized correctly.
              */
              OUTREGP(CRTC_MORE_CNTL, CRTC_H_CUTOFF_ACTIVE_EN,
                      ~CRTC_H_CUTOFF_ACTIVE_EN);