pvr: Don't allocate/upload 0 size coeff programs
Fixes assert seen in dEQP-Vk.api.smoke.triangle
Signed-off-by: Jarred Davies jarred.davies@imgtec.com
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Fixes assert seen in dEQP-Vk.api.smoke.triangle
Signed-off-by: Jarred Davies jarred.davies@imgtec.com