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sdnvme: revert removal of braces, fix empty if-body warning

removing braces here triggers a warning
for emptry if body because dmaflush()
is a empty macro in pc/pc64 kernels.

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

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

@@ -208,8 +208,9 @@

 	SQ *sq = ws->queue;

 	Ctlr *ctlr = sq->ctlr;

-	if(e != nil)

+	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) {

@@ -269,8 +270,9 @@

 		count -= n;

 		lba += n;

 	}

-	if(!write)

+	if(!write){

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

+	}

 	return p - (uchar*)a;

 }