[PATCH] Bug in displaying error message while using -u option

[Srinivasa Ds]

when we use a wrong username in -u option of strace,we get the following
error.
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strace -u <non existing user name> echo hi
strace: cannot find user `(null)'

Instead of "null", we shld see wrong username.
=========================================

Here is the patch,which does so, please let me know your comments

signed-off by: srinivasa at in.ibm.com
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