RTEMS | GRCANFD: Fix Coverity issues (!390)

[Gedare Bloom (@gedare)]

Gedare Bloom started a new discussion on bsps/shared/grlib/can/grcanfd.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/390#note_119131

 >  				return GRCAN_RET_INVARG;
 >  			break;
 >  		}
 > -		dest->head[1] = (dlc << 28) |
 > +		dest->head[1] = ((dlc & 0xf) << 28) |

I would suggest keeping `uint8_t dlc` and use `if (dlc > 15)` instead of `if (dlc < 0)`.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/390#note_119131
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