ac/nir: fix GS load input type.

Fixes: df1d5174fc "ac/nir: replace SI.buffer.load.dword with amdgcn.buffer.load"
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>

src/amd/common/ac_nir_to_llvm.c

@@ -3075,7 +3075,7 @@ load_gs_input(struct ac_shader_abi *abi,
 		}
 	}
 	result = ac_build_varying_gather_values(&ctx->ac, value, num_components, component);
-
+	result = ac_to_integer(&ctx->ac, result);
 	return result;
 }