RTEMS | kern_ntptime.c: Negative Shift Value Warning (#5339)

[Joel Sherrill (@joel)]

Joel Sherrill created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5339



## Summary

The following warning is generated on every target.

```
../../../cpukit/score/src/kern_ntptime.c:122:50: warning: left shift of negative value [-Wshift-negative-value]
../../../cpukit/score/src/kern_ntptime.c:124:45: warning: left shift of negative value [-Wshift-negative-value]
```

The code in question is included. The true path is line 122.

```
#define L_LINT(v, a) \
	do { \
		if ((a) < 0) \
			((v) = -((int64_t)(-(a)) << 32)); \
		else \
			((v) = (int64_t)(a) << 32); \
	} while (0)
```


### Pre-set options

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5339
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