drm/radeon: remove dead code in ni_mc_load_microcode()

Inside the if block with (running == 0), the checks for 'running'
possibly being non-zero are redundant. Remove them altogether.

This change is similar to the one authored by Heinrich Schuchardt
<xypron.glpk@gmx.de> in commit
ddbbd3be ("drm/radeon: remove dead code, si_mc_load_microcode (v2)")

Found by Linux Verification Center (linuxtesting.org) with static
analysis tool Svace.

Fixes: 0af62b01 ("drm/radeon/kms: add ucode loader for NI")
Signed-off-by: Nikita Zhandarovich <n.zhandarovich@fintech.ru>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/ni.c

@@ -618,7 +618,7 @@ static const u32 cayman_io_mc_regs[BTC_IO_MC_REGS_SIZE][2] = {
 int ni_mc_load_microcode(struct radeon_device *rdev)
 {
 	const __be32 *fw_data;
-	u32 mem_type, running, blackout = 0;
+	u32 mem_type, running;
 	u32 *io_mc_regs;
 	int i, ucode_size, regs_size;
 
@@ -653,11 +653,6 @@ int ni_mc_load_microcode(struct radeon_device *rdev)
 	running = RREG32(MC_SEQ_SUP_CNTL) & RUN_MASK;
 
 	if ((mem_type == MC_SEQ_MISC0_GDDR5_VALUE) && (running == 0)) {
-		if (running) {
-			blackout = RREG32(MC_SHARED_BLACKOUT_CNTL);
-			WREG32(MC_SHARED_BLACKOUT_CNTL, 1);
-		}
-
 		/* reset the engine and set to writable */
 		WREG32(MC_SEQ_SUP_CNTL, 0x00000008);
 		WREG32(MC_SEQ_SUP_CNTL, 0x00000010);
@@ -683,9 +678,6 @@ int ni_mc_load_microcode(struct radeon_device *rdev)
 				break;
 			udelay(1);
 		}
-
-		if (running)
-			WREG32(MC_SHARED_BLACKOUT_CNTL, blackout);
 	}
 
 	return 0;