typo fixes: aquire -> acquire

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Acked-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/video/bt8xx/bttvp.h b/drivers/media/video/bt8xx/bttvp.h
index d295601..311c4c5 100644
--- a/drivers/media/video/bt8xx/bttvp.h
+++ b/drivers/media/video/bt8xx/bttvp.h
@@ -360,7 +360,7 @@
 	int mbox_csel;
 
 	/* risc memory management data
-	   - must aquire s_lock before changing these
+	   - must acquire s_lock before changing these
 	   - only the irq handler is supported to touch top + bottom + vcurr */
 	struct btcx_riscmem     main;
 	struct bttv_buffer      *screen;    /* overlay             */