target/ppc: Add missing helper_reset_fpstatus to helper_XVCVSPBF16

Fixes: 3909ff1fac ("target/ppc: Implement xvcvbf16spn and xvcvspbf16 instructions")
Signed-off-by: Víctor Colombo <victor.colombo@eldorado.org.br>
Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220304175156.2012315-8-matheus.ferst@eldorado.org.br>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

target/ppc/fpu_helper.c

@@ -2774,6 +2774,8 @@ void helper_XVCVSPBF16(CPUPPCState *env, ppc_vsr_t *xt, ppc_vsr_t *xb)
     ppc_vsr_t t = { };
     int i, status;
 
+    helper_reset_fpstatus(env);
+
     for (i = 0; i < 4; i++) {
         t.VsrH(2 * i + 1) = float32_to_bfloat16(xb->VsrW(i), &env->fp_status);
     }