r600g: RSQ: clear NEG for operand

Need to clear NEG bit because it applies after ABS, e.g. "RSQ ..., -1"
uses -|1| as operand.

Signed-off-by: Vadim Girlin <vadimgirlin@gmail.com>

src/gallium/drivers/r600/r600_shader.c

@@ -1506,6 +1506,7 @@ static int tgsi_rsq(struct r600_shader_ctx *ctx)
 	for (i = 0; i < inst->Instruction.NumSrcRegs; i++) {
 		r600_bc_src(&alu.src[i], &ctx->src[i], 0);
 		alu.src[i].abs = 1;
+		alu.src[i].neg = 0;
 	}
 	alu.dst.sel = ctx->temp_reg;
 	alu.dst.write = 1;