drm/radeon: Move assignment outside if condition

Fixes the following checkpatch errors:

ERROR: do not use assignment in if condition

Signed-off-by: Ran Sun <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/radeon/radeon_legacy_tv.c

···
 	}
 
 	for (i = 0; i < MAX_H_CODE_TIMING_LEN; i++) {
-		if ((tv_dac->tv.h_code_timing[i] = hor_timing[i]) == 0)
+		tv_dac->tv.h_code_timing[i] = hor_timing[i];
+		if (tv_dac->tv.h_code_timing[i] == 0)
 			break;
 	}
 
 	for (i = 0; i < MAX_V_CODE_TIMING_LEN; i++) {
-		if ((tv_dac->tv.v_code_timing[i] = vert_timing[i]) == 0)
+		tv_dac->tv.v_code_timing[i] = vert_timing[i];
+		if (tv_dac->tv.v_code_timing[i] == 0)
 			break;
 	}