Explicitly deallocate storage before exit.

ChangeLog

 2012-09-10  Niels Möller  <nisse@lysator.liu.se>
 
+	* examples/eratosthenes.c (main): Explicitly deallocate storage
+	before exit.
+
 	* examples/io.c (read_file): Explicitly treat an empty file as an
 	error. Rearrange loop, check for short fread return value.
 

examples/eratosthenes.c

@@ -399,5 +399,9 @@ main (int argc, char **argv)
 	    printf("%lu\n", n);
 	}
     }
+
+  free(sieve);
+  free(block);
+
   return EXIT_SUCCESS;
 }