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efi: ensure 8 byte alignment of buffer, as ReadBlocks() method will fail otherwise

--- a/sys/src/boot/efi/iso.c

+++ b/sys/src/boot/efi/iso.c

@@ -171,9 +171,10 @@

 static void*

 isoopen(char *path)

 {

-	static Extend ex[1];

+	static uchar buf[sizeof(Extend)+8];

+	Extend *ex = (Extend*)((uintptr)(buf+7)&~7);

-	if(isowalk(ex,  path))

+	if(isowalk(ex, path))

 		return nil;

 	return ex;

 }

--- a/sys/src/boot/efi/pxe.c

+++ b/sys/src/boot/efi/pxe.c

@@ -306,7 +306,8 @@

 static void*

 pxeopen(char *name)

 {

-	static Tftp t[1];

+	static uchar buf[sizeof(Tftp)+8];

+	Tftp *t = (Tftp*)((uintptr)(buf+7)&~7);

 	memset(t, 0, sizeof(Tftp));

-- 

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