Partly fixes <https://bugs.gnu.org/47867>.
Reported by Florian Pelz <pelzflorian@pelzflorian.de>.
The non-tail recursive call to 'connect' could cause requests to be
processed twice, with 'p' possibly closed the second time.
Regression introduced in 205833b72c5517915a47a50dbe28e7024dc74e57 and
carried over in 45fce38fb0b6c6796906149ade145b8d3594c1c6.
* guix/http-client.scm (http-multiple-get): Remove call to 'close-port'
and recursive call to 'connect' when the 'write-request' block returns #f.
