Build fail in drivers/gpu/drm/i915/display/intel_tc.c

[David Laight]

I'm seeing a build fail at line 1878 of intel_tc.c

gcc is being a bit over-enthusiastic about snprintf() formats
and reports that "%c/TC#%d", xxx, tc_port + 1 might not fit
in the 8 bytes available.
'tc_port' is an enum with values -1 to 5.
I guess it is either allowing for the full 'int' value of
the enum.
Changing to '(tc_port & 7) + 1' stops the compiler bleating.

The code isn't new, so I guess the compiler flags have changed?

It might depend on the gcc version as well.
I'm using gcc 7.5.0 from Ubuntu 18.04.

	David

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