staging: crystalhd: return true and false instead of 1 and 0

This fixes coccinelle error regarding functions that return
bool and return 1 and 0 instead of true and false.
Signed-off-by: Valentina Manea <valentina.manea.m@gmail.com>
Reviewed-by: Lisa Nguyen <lisa@xenapiadmin.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/crystalhd/crystalhd_cmds.c

@@ -1059,7 +1059,7 @@ bool crystalhd_cmd_interrupt(struct crystalhd_cmd *ctx)
 {
 	if (!ctx) {
 		BCMLOG_ERR("Invalid arg..\n");
-		return 0;
+		return false;
 	}
 
 	return crystalhd_hw_interrupt(ctx->adp, &ctx->hw_ctx);