drm/amdgpu: Fix wait for RLCG command completion

if (!(tmp & flag)) condition will always evaluate to true
when the flag is 0x0. Instead check that address bits
are cleared to determine whether the command is complete.

Signed-off-by: Victor Skvortsov <victor.skvortsov@amd.com>
(cherry picked from commit 4d3a7668c52401807316c754e575452a8d6573a5)

Change-Id: I979ff7334db5c917de7b34feff98699f65ec625a

drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c

@@ -789,7 +789,8 @@ static u32 gfx_v9_0_rlcg_rw(struct amdgpu_device *adev, u32 offset, u32 v, uint3
 
 		for (i = 0; i < retries; i++) {
 			tmp = readl(scratch_reg1);
-			if (!(tmp & flag))
+			//Check the address bits
+			if (!(tmp & 0xFFFFF))
 				break;
 
 			udelay(10);