soc: mediatek: pwrap: use true and false for boolean values

Return statements in functions returning bool should use true or false
instead of an integer value.

This issue was detected with the help of Coccinelle.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Acked-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

drivers/soc/mediatek/mtk-pmic-wrap.c

@@ -1224,7 +1224,7 @@ static bool pwrap_is_pmic_cipher_ready(struct pmic_wrapper *wrp)
 	ret = pwrap_read(wrp, wrp->slave->dew_regs[PWRAP_DEW_CIPHER_RDY],
 			 &rdata);
 	if (ret)
-		return 0;
+		return false;
 
 	return rdata == 1;
 }