🐛 [newlib] fix broken sbrk function
#957
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- check pointer returned by malloc - add time function test
+ add support for time() function + massive cleanup
stnolting
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bug
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A bug in the implementation of newlib's
sbrkfunction causedmallocto always make memory available, even though the heap was already full. This caused a collision of heap and stack and finally a CPU crash.sbrkfunction;mallocworks now as expectedtime()function