diskio.h uses same error code values as FatFs

[kschwi]

The error codes != 0 are not unique between FatFs and diskio.h. Both use the same values with different meaning. The enum DRESULT should be changed as follows:

/* Results of Disk Functions /
typedef enum {
RES_OK = 0, / 0: Successful /
RES_ERROR=101, / 101: R/W Error /
RES_WRPRT, / 102: Write Protected /
RES_NOTRDY, / 103: Not Ready /
RES_PARERR / 104: Invalid Parameter */
} DRESULT;

This makes porting simpler and gives clear information about about the problem.
Cheers,
Knut