xtensa: use "test -e" instead of bashism "test -a"
On Ubuntu, /bin/sh is a symlink to dash, which does not support "test -a". This causes messages like test: 1: -a: unexpected operator test: 1: -a: unexpected operator and link failures like (.init.text+0x132): undefined reference to `platform_init' due to the appropriate platform code not being compiled. Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org> Cc: Chris Zankel <chris@zankel.net> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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