drm/radeon: fix typo in bandwidth calculation

The RV3xx settings were getting applied to all older asics
rather than just RV3xx.

Reported-by: David Binderman <dcb314@hotmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/r100.c

@@ -3295,7 +3295,7 @@ void r100_bandwidth_update(struct radeon_device *rdev)
 		mem_trp = ((temp >> 8) & 0x7) + 1;
 		mem_tras = ((temp >> 11) & 0xf) + 4;
 	} else if (rdev->family == CHIP_RV350 ||
-		   rdev->family <= CHIP_RV380) {
+		   rdev->family == CHIP_RV380) {
 		/* rv3x0 */
 		mem_trcd = (temp & 0x7) + 3;
 		mem_trp = ((temp >> 8) & 0x7) + 3;