drm/amd/display: Remove wrong signal from vrr calculation

In some of the merge conflict fixes, one '+' was accidentally left at
the beginning of the line. Fortunately, this did not cause any major
issues since it acted as a number signal. This commit addresses this
issue by removing the extra '+'.

Acked-by: Wayne Lin <[e-mail]>
Signed-off-by: Rodrigo Siqueira <[e-mail]>
Tested-by: Daniel Wheeler <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/modules/freesync/freesync.c

···
 			in_out_vrr->fixed_refresh_in_uhz = 0;
 
 		refresh_range = div_u64(in_out_vrr->max_refresh_in_uhz + 500000, 1000000) -
-+				div_u64(in_out_vrr->min_refresh_in_uhz + 500000, 1000000);
+				div_u64(in_out_vrr->min_refresh_in_uhz + 500000, 1000000);
 
 		in_out_vrr->supported = true;
 	}