After allocating sata->cmd_hdr_tbl_offset we have to check
this variable and not variable sata.
The problem was indicated by cppcheck.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Tom Rini <trini@konsulko.com>
        length = sizeof(struct cmd_hdr_tbl);
        align = SATA_HC_CMD_HDR_TBL_ALIGN;
        sata->cmd_hdr_tbl_offset = (void *)malloc(length + align);
-       if (!sata) {
+       if (!sata->cmd_hdr_tbl_offset) {
                printf("alloc the command header failed\n\r");
                return -1;
        }