[Bug malloc/15089] malloc_trim always trims for large padding

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https://sourceware.org/bugzilla/show_bug.cgi?id=15089

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=51a7380b8968251a49a4c5b0bc7ed1af5b0512c6

commit 51a7380b8968251a49a4c5b0bc7ed1af5b0512c6
Author: Will Newton <will.newton@linaro.org>
Date:   Fri Jun 13 16:37:12 2014 +0100

    malloc/malloc.c: Avoid calling sbrk unnecessarily with zero

    Due to my bad review suggestion for the fix for BZ #15089 a check
    was removed from systrim to prevent sbrk being called with a zero
    argument. Add the check back to avoid this useless work.

    ChangeLog:

    2014-06-19  Will Newton  <will.newton@linaro.org>

        * malloc/malloc.c (systrim): If extra is zero then return
        early.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog       |    5 +++++
 malloc/malloc.c |    3 +++
 2 files changed, 8 insertions(+), 0 deletions(-)

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