Tokyo stocks eked out gains Wednesday after erasing earlier losses from a strong yen against the U.S. dollar, although advances were limited by caution ahead of the release of the earnings results of U.S. chip giant Nvidia Corp. The 225-issue Nikkei Stock Average ended up 83.14 points, or 0.22 percent, from Tuesday at 38,371.76. The broader Topix index finished 11.32 points, or 0.42 percent, higher at 2,692.12. On the top-tier Prime Market, gainers were led by transportation equipment, insurance and pharmaceutical issues. Stocks were mostly in negative territory in the morning, with investors …