some tabs to spaces

cd src
    grep -P -n '\t' *.c | grep -v "1:"
    cd ../include
    grep -P -n '\t' *.h | grep -v "1:"
    cd ..

side note: win/Qt/*.cpp are full of tabs

src/restore.c

@@ -1484,7 +1484,7 @@ validate(NHFILE* nhfp, const char *name)
     } else {
         if (nhfp->structlevel)
             rlen = (readLenType) read(nhfp->fd, (genericptr_t) &sfi, sizeof sfi);
-        minit();		/* ZEROCOMP */
+        minit();        /* ZEROCOMP */
         if (rlen == 0) {
             if (verbose) {
                 pline("File \"%s\" is empty during save file feature check?", name);