dload: unlink file on filesize exceeded error

On filesize exceeded error pacman leaves a .part file in cache dir,
resulting in this error on next try:

error: failed to commit transaction (wrong or NULL argument passed)
Errors occurred, no packages were upgraded.

Unlink the file on error to avoid this.

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/libalpm/dload.c b/lib/libalpm/dload.c
index 4fc2dcbb..43c15035 100644
--- a/lib/libalpm/dload.c
+++ b/lib/libalpm/dload.c
@@ -494,6 +494,7 @@ static int curl_download_internal(struct dload_payload *payload,
 			/* handle the interrupt accordingly */
 			if(dload_interrupted == ABORT_OVER_MAXFILESIZE) {
 				payload->curlerr = CURLE_FILESIZE_EXCEEDED;
+				payload->unlink_on_fail = 1;
 				handle->pm_errno = ALPM_ERR_LIBCURL;
 				_alpm_log(handle, ALPM_LOG_ERROR,
 						_("failed retrieving file '%s' from %s : expected download size exceeded\n"),