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rio: remove useless if()

--- a/sys/src/cmd/rio/rio.c

+++ b/sys/src/cmd/rio/rio.c

@@ -1243,8 +1243,7 @@

 				}

 			}

 			n = e - p;

-			if(n > 0)

-				memmove(buf, p, n);

+			memmove(buf, p, n);

 			p = buf + n;

 		}

 		close(fd);

-- 

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