Fix log message warning in SBThread.
Fix log message warning in SBThread.

Summary:
The format string was not set up correctly as it was missing the %.
This resulted in a warning (correctly) that the data arguments were
not all used.

Reviewers: clayborg, jingham

Subscribers: lldb-commits

Differential Revision: http://reviews.llvm.org/D12714

git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@247111 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb