Return only -1 in starpu_get_memory_location_bitmap() in case of error

3 jobs for !20 with fxt-buffer-location in 21 minutes and 13 seconds (queued for 2 seconds)
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passed #1436382
build

00:06:02

 
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linux
check_linux

00:11:05

passed #1436384
simgrid

00:04:06