only request free space once for external shares

Signed-off-by: Robin Appelman <robin@icewind.nl>

apps/files_sharing/lib/External/Storage.php

@@ -429,4 +429,8 @@ class Storage extends DAV implements ISharedStorage, IDisableEncryptionStorage,
 
 		return $permissions;
 	}
+
+	public function free_space($path) {
+		return parent::free_space("");
+	}
 }

lib/private/Files/Cache/Propagator.php

@@ -145,7 +145,7 @@ class Propagator implements IPropagator {
 			$this->batch[$internalPath] = [
 				'hash' => md5($internalPath),
 				'time' => $time,
-				'size' => $sizeDifference
+				'size' => $sizeDifference,
 			];
 		} else {
 			$this->batch[$internalPath]['size'] += $sizeDifference;