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sdnvme: avoid "empty if body" warning

dmaflush() is a no-op macro on amd64, so
wrap all calls into {} braces to avoid
the compiler warning.

--- a/sys/src/9/port/sdnvme.c

+++ b/sys/src/9/port/sdnvme.c

@@ -211,7 +211,9 @@

 	SQ *sq = ws->queue;

 	Ctlr *ctlr = sq->ctlr;

-	if(e != nil) dmaflush(1, e, 64);

+	if(e != nil) {

+		dmaflush(1, e, 64);

+	}

 	coherence();

 	ctlr->reg[DBell + ((sq-ctlr->sq)*2+0 << ctlr->dstrd)] = sq->tail & sq->mask;

 	if(sq > ctlr->sq) {

@@ -271,7 +273,9 @@

 		count -= n;

 		lba += n;

 	}

-	if(!write) dmaflush(0, a, p - (uchar*)a);

+	if(!write) {

+		dmaflush(0, a, p - (uchar*)a);

+	}

 	return p - (uchar*)a;

 }

@@ -460,9 +464,9 @@

 	e = qcmd(&ws, ctlr, 1, 0x06, 0, nil, ctlr->nsid, 0x1000);

 	e[10] = 2; // namespace list 

-	if(wcmd(&ws, e) == 0)

+	if(wcmd(&ws, e) == 0) {

 		dmaflush(0, ctlr->nsid, 0x1000);

-	else

+	} else

 		ctlr->nsid[0] = 1;	/* assume namespace #1 */

 	ctlr->nnsid = 0;