alpm_logaction: allow falling back to syslog

Even if opening the log file fails, if a user has enabled syslog we may
still be able to log to that.  Set the error return value and continue
instead of bailing out.

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

lib/libalpm/log.c

@@ -68,7 +68,7 @@ int SYMEXPORT alpm_logaction(alpm_handle_t *handle, const char *prefix,
 			} else {
 				handle->pm_errno = ALPM_ERR_SYSTEM;
 			}
-			return -1;
+			ret = -1;
 		}
 	}