Handle PM_ERR_WRITE in alpm_strerror()

PM_ERR_WRITE is defined in alpm.h but not handled in
alpm_strerror(). This patch corrects that.

Signed-off-by: Pang Yan Han <pangyanhan@gmail.com>
Signed-off-by: Dan McGee <dan@archlinux.org>

lib/libalpm/error.c

@@ -135,6 +135,8 @@ const char SYMEXPORT *alpm_strerror(int err)
 		/* Miscellaenous */
 		case PM_ERR_RETRIEVE:
 			return _("failed to retrieve some files");
+		case PM_ERR_WRITE:
+			return _("failed to copy some file");
 		case PM_ERR_INVALID_REGEX:
 			return _("invalid regular expression");
 		/* Errors from external libraries- our own wrapper error */