By Anshuman Daga and Lawrence White SINGAPORE/LONDON (Reuters) – HSBC has shelved plans for fresh stock buybacks this year after reporting an unexpected hit to its capital on Tuesday, as a cocktail of rising inflation, geopolitical drama and economic weakness dented its prospects. Shares in Europe’s biggest bank were trading 2.2% lower by 0825 GMT against a 0.6% gain in the benchmark FTSE 100 index and a more buoyant banking index, as investors reacted to revised payout plans, which compounded disappointing news on the bank’s balance sheet. HSBC’s core capital ratio, a key measure of a bank’s …