Fix mv same file error

Author: ekzyis

delete_nonreduced_fuzz_inputs.sh

@@ -83,7 +83,8 @@ git clone --depth=1 --no-single-branch https://github.com/bitcoin/bitcoin.git
       mkdir --parents "$FUZZ_TARGET_DIR/$ref_sha1"
       # Allow timeouts and crashes with "-A", "-T all" to use all available cores
       FUZZ=$fuzz_target afl-cmin -T all -A -i "../all_inputs/$fuzz_target" -o "$FUZZ_TARGET_DIR/$ref_sha1" -- ./build_fuzz/bin/fuzz
-      mv "$FUZZ_TARGET_DIR/$ref_sha1/"* "$FUZZ_TARGET_DIR/"
+      # use cp instead of mv because mv fails if source and destination is same file
+      cp "$FUZZ_TARGET_DIR/$ref_sha1/"* "$FUZZ_TARGET_DIR/"
       rm -r "$FUZZ_TARGET_DIR/$ref_sha1"
     done
   done