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kernel: remove waserror() arround newpage() in mntcache

newpage() does not raise error().

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

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

@@ -350,12 +350,11 @@

 					pe = offset+l;

 			}

 		} else {

-			if(needpages(nil) || waserror()){

+			if(needpages(nil)){

 				invalidate(m, offset + pn*BY2PG, len);

 				break;

 			}

 			p = newpage(0, nil, pn*BY2PG);

-			poperror();

 			p->daddr = cacheaddr(m, pn);

 			cachedel(&fscache, p->daddr);

 			cachepage(p, &fscache);