mmcsd_sdio: SDIO_RECVSETUP/SENDSETUP return values ignored on the non-DMA data paths #20399

In drivers/mmcsd/mmcsd_sdio.c the return value of SDIO_RECVSETUP is discarded on the non-DMA read paths, so when the lower half fails to set up the receive the driver still issues CMD17/CMD18 and the failure only surfaces later as an unrelated-looking transfer timeout:

• mmcsd_readsingle() — line 1665
• mmcsd_readmultiple() — line 1821

The DMA paths in the same functions check SDIO_DMARECVSETUP and bail out (:1654-1661, :1810-1818), which makes the unchecked non-DMA paths look like an oversight. The write side has the same asymmetry: SDIO_SENDSETUP goes unchecked in mmcsd_writesingle() (:2016) and mmcsd_writemultiple() (:2268), while the DMA send paths check theirs. There are a few more unchecked sites as well (:573, :2839, :3431, :3568, :3696).

The fix is to check the return value, SDIO_CANCEL and propagate the error, mirroring the DMA paths. Happy to open a PR.