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sdiahci, sdodin: more unconfigure panic fixes

--- a/sys/src/9/pc/sdiahci.c

+++ b/sys/src/9/pc/sdiahci.c

@@ -170,7 +170,7 @@

 };

 static	Ctlr	iactlr[NCtlr];

-static	SDev	sdevs[NCtlr];

+static	SDev	*sdevs;

 static	int	niactlr;

 static	Drive	*iadrive[NDrive];

@@ -2167,6 +2167,9 @@

 	}

 	memset(olds, 0xff, sizeof olds);

+	sdevs = malloc(sizeof(SDev)*NCtlr);

+	if(sdevs == nil)

+		return nil;

 	p = nil;

 	while((p = pcimatch(p, 0, 0)) != nil){

 		if((type = didtype(p)) == -1)

--- a/sys/src/9/pc/sdodin.c

+++ b/sys/src/9/pc/sdodin.c

@@ -543,7 +543,7 @@

 };

 static	Ctlr	msctlr[Nctlr];

-static	SDev	sdevs[Nctlr];

+static	SDev	*sdevs;

 static	uint	nmsctlr;

 static	Drive	*msdrive[Ndrive];

 static	uint	nmsdrive;

@@ -2646,6 +2646,9 @@

 		return nil;

 	s0 = nil;

 	ll = &s0;

+	sdevs = malloc(sizeof(SDev)*NCtlr);

+	if(sdevs == nil)

+		return nil;

 	for(p = nil; (p = pcimatch(p, 0x11ab, 0x6485)) != nil; ){

 		if(nmsctlr == Nctlr){

 			print("sdodin: too many controllers\n");