sh: add missing quote, drop no longer used var, fixup printf mask, shellcheck warnings cleanup

Author: vszakats

ossfuzz.sh

@@ -42,7 +42,7 @@ scripts/create_zip.sh
 # Copy the fuzzers over.
 for TARGET in $FUZZ_TARGETS
 do
-  cp -v build/"${TARGET}" "${TARGET}"_seed_corpus.zip "$OUT"/
+  cp -v build/"${TARGET}" "${TARGET}_seed_corpus.zip" "$OUT"/
 done
 
 # Copy dictionary and options file to $OUT.