[Buildroot] diff two identical files

[Ming-Ching Tiew <mingching.tiew@redtone.com>]

Using the crossed compiled 'diff' from the buildroot on the 
target system will hit error if the source and destination file
are identical :-

         # diff a b
memory exhausted

There is no error if a and b are slightly different. 

If I compile difftutils natively there is no problem.



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