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kernel: fix devsrv compilation on arm32

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

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

@@ -5,7 +5,7 @@

 #include	"fns.h"

 #include	"../port/error.h"

-#define SRVTYPE(x)	(((uvlong)x)&0x3)

+#define SRVTYPE(x)	(((uint)x)&0x3)

 #define SRVPATH(x)	(((uvlong)x)>>2)

 #define SRVQID(x, t)	((((uvlong)x)<<2)|((t)&0x3))

@@ -99,7 +99,6 @@

 {

 	Srv *sp, *prv;

 	Board *ch;

-	long ref;

 	if(b == &root)

 		return;

@@ -117,7 +116,8 @@

 		}

 		b->srv = nil;

 	}

-	ref = decref(b);

+	if(decref(b) != 0)

+		return;

 	/*

 	 * All boards must be walkable from root. So a board

@@ -125,7 +125,7 @@

 	 * still has active children. For leaf nodes we then

 	 * have to walk up the tree to clear now empty parents.

 	 */

-	while(b->closed && b->child == nil && ref == 0){

+	while(b->closed && b->child == nil){

 		//Root should never be closed

 		assert(b->parent != nil);

 		ch = remove((Link**)&b->parent->child, b->name, ~0UL);