drm/i915: fix if statement (bogus semi-colon)

The semi-colon is a typo here and it makes the if statement
unconditional.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Keith Packard <keithp@keithp.com>
diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c
index 66cd0b8..3a8d44886 100644
--- a/drivers/char/agp/intel-gtt.c
+++ b/drivers/char/agp/intel-gtt.c
@@ -1236,7 +1236,7 @@
 		intel_private.gtt_bus_addr = reg_addr + gtt_offset;
 	}
 
-	if (needs_idle_maps());
+	if (needs_idle_maps())
 		intel_private.base.do_idle_maps = 1;
 
 	intel_i9xx_setup_flush();