Simplify some Perl.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@6569

perf/vg_perf.in

@@ -240,9 +240,9 @@ sub time_prog($$)
             die "\n*** Command returned non-zero ($retval)"
               . "\n*** See perf.{cmd,stdout,stderr} to determine what went wrong.\n";
         my $out = `cat perf.stderr`;
-        ($out =~ /[Uu]ser([ ]+)([\d\.]+)/) or 
+        ($out =~ /[Uu]ser +([\d\.]+)/) or 
             die "\n*** missing usertime in perf.stderr\n";
-        $tmin = $2 if ($2 < $tmin);
+        $tmin = $1 if ($1 < $tmin);
     }
     # Avoid divisions by zero!
     return (0 == $tmin ? 0.01 : $tmin);