i965/fs: fix integer textures with swizzles

This happened to work before, but it would convert the output to a float
and then back to an integer which seems bad.

Signed-off-by: Connor Abbott <connor.abbott@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>
1 file changed