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libventi: ensure there is sufficient room for padding

--- a/sys/src/libventi/mem.c

+++ b/sys/src/libventi/mem.c

@@ -65,7 +65,7 @@

 	else	

 		align = 4;

-	if(n > ChunkSize){

+	if(n + align > ChunkSize){

 		p = sbrk(n);

 		if(p == (void*)-1)

 			sysfatal("Failed to allocate permanent chunk size %lud", n);

-- 

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