Always unlock node after trying to create a share

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

apps/files_sharing/lib/API/Share20OCS.php

@@ -402,8 +402,10 @@ class Share20OCS extends OCSController {
 		} catch (GenericShareException $e) {
 			$code = $e->getCode() === 0 ? 403 : $e->getCode();
 			throw new OCSException($e->getHint(), $code);
-		}catch (\Exception $e) {
+		} catch (\Exception $e) {
 			throw new OCSForbiddenException($e->getMessage());
+		} finally {
+			$share->getNode()->unlock(ILockingProvider::LOCK_SHARED);
 		}
 
 		$output = $this->formatShare($share);

lib/private/Share20/Share.php

@@ -160,7 +160,7 @@ class Share implements \OCP\Share\IShare {
 
 			$nodes = $userFolder->getById($this->fileId);
 			if (empty($nodes)) {
-				throw new NotFoundException();
+				throw new NotFoundException('Node for share not found, fileid: ' . $this->fileId);
 			}
 
 			$this->node = $nodes[0];