fix a few leaks.

Reference: /n/sources/patch/applied/libhtml-tableak
Date: Sun Jul 23 22:13:01 CES 2006
Signed-off-by: quanstro@quanstro.net

--- /sys/src/libhtml/build.c	Sun Jul 23 22:11:03 2006
+++ /sys/src/libhtml/build.c	Sun Jul 23 22:09:29 2006
@@ -1800,6 +1800,7 @@
 	}
 	outerps = lastps(ps);
 	ans = outerps->items->next;
+	freeitem(outerps->items);
 	// note: ans may be nil and di->kids not nil, if there's a frameset!
 	outerps->items = newispacer(ISPnull);
 	outerps->lastit = outerps->items;
@@ -2563,6 +2564,8 @@
 			}
 		}
 	}
+	free(rowspancnt);
+	free(rowspancell);
 }
 
 // Remove tail of cell content until it isn't whitespace.