The '||' path of execution in the 'test' block of the check_2() function
may also be taken if file2 does not exist, in which case the warning
message about the ABI headers being different would still be printed
where it should not be.  See below.

  % file1=file1; file2=file2
  % cmd="echo diff $file1 $file2"
  % test -f $file2 && \
    eval $cmd || echo "Warning: Kernel ABI header at 'tools/$file1'
                       differs from latest version at '$file2'" >&2
                       Warning: Kernel ABI header at 'tools/file1' differs from latest
                       version at 'file2'

The proposed patch converts the code following the '&&' operator into a
compound list to be executed in the current process environment only if file2
does exist. Should the files being compared differ, a diff command to compare
the files concerned is printed on standard output. E.g.

  $ diff -u tools/arch/x86/lib/memcpy_64.S arch/x86/lib/memcpy_64.S

Committer testing:

Remove a line from that tools/arch/x86/lib/memcpy_64.S file to test
this:

  BUILD:   Doing 'make -j4' parallel build
Warning: Kernel ABI header at 'tools/arch/x86/lib/memcpy_64.S' differs from latest version at 'arch/x86/lib/memcpy_64.S'
diff -u tools/arch/x86/lib/memcpy_64.S arch/x86/lib/memcpy_64.S
  CC       /tmp/build/perf/bench/mem-memcpy-x86-64-asm.o
Signed-off-by: NAlexander Kapshuk <alexander.kapshuk@gmail.com>
Tested-by: NArnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: NJiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180811083915.17471-1-alexander.kapshuk@gmail.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>