MAKEALL: Allow empty ERR directory
If we build everything correctly with multiple builds, and an ERR directory had been previously created, we failed to report that everything was fine because grep failed to find anything in the ERR directory. Use grep -r, which doesn't complain if there are no input files. Signed-off-by: NAndy Fleming <afleming@freescale.com> Tested-by: NTom Rini <trini@ti.com>
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