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git/walk: filter out files from within the .git repo

Bugs in utilities like git/add can accidentally add files
that should be impossible to track; git/walk should just
not print them.

--- a/sys/src/cmd/git/walk.c

+++ b/sys/src/cmd/git/walk.c

@@ -445,6 +445,11 @@

 				idx = realloc(idx, idxsz*sizeof(Idxent));

 			}

 			cleanname(parts[3]);

+			if(strncmp(parts[3], ".git/", 5) == 0){

+				staleidx = 1;

+				free(ln);

+				continue;

+			}

 			idx[nidx].state = *parts[0];

 			idx[nidx].qid = parseqid(parts[1]);

 			idx[nidx].mode = strtol(parts[2], nil, 8);