do not crash when a manpath directory contains a symbolic link

that points to a directory rather than to a regular file;
bug reported by Lukas Epple <sternenseemann at systemli dot org>,
and my patch also tested by him on NixOS

1 files changed, 2 insertions, 0 deletions

diff --git a/mandocdb.c b/mandocdb.c
index cbbb8f60..bc432070 100644
--- a/mandocdb.c
+++ b/mandocdb.c
@@ -629,6 +629,8 @@ treescan(void)
 					say(path, "&stat");
 				continue;
 			}
+			if ((ff->fts_statp->st_mode & S_IFMT) != S_IFREG)
+				continue;
 			/* FALLTHROUGH */
 
 		/*