[strace/strace] fix modify_ldt failed beacause of no error info like this: (#119)

[xuchunmei000]

modify_ldt(0, NULL, 0) = -1
modify_ldt(-629534633, 0xffffffffffffffff, 16045756814261206767) = -1
modify_ldt(-629534633, 0x7f354d38a000, 0) = -1
modify_ldt(-629534633, 0x7f354d389ff0, 42) = -1
modify_ldt(-629534633, 0x7f354d38a000, 16) = -1
modify_ldt(-629534633, 0x7f354d1bbffc, 16) = -1
modify_ldt(-629534633, {entry_number=2206368128, base_addr=0x87868584,
limit=0x8b8a8988, seg_32bit=0, contents=2, read_exec_only=1,
limit_in_pages=0, seg_not_present=0, useable=0, lm=1}, 16) = -1
modify_ldt(-629534633, {entry_number=-1, base_addr=00000000,
limit=00000000, seg_32bit=1, contents=0, read_exec_only=0,
limit_in_pages=0, seg_not_present=1, useable=1, lm=0}, 16) = -1
You can view, comment on, or merge this pull request online at:

  https://github.com/strace/strace/pull/119

-- Commit Summary --

  * fix modify_ldt failed beacause of no error info like this:

-- File Changes --

    M tests/modify_ldt.c (6)

-- Patch Links --

https://github.com/strace/strace/pull/119.patch
https://github.com/strace/strace/pull/119.diff

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