tsan: fix compiler warning
tsan: fix compiler warning

mingw gcc complains:
warning: 'err' may be used uninitialized in this function [-Wmaybe-uninitialized]
       Printf("Failed to read options from '%s': error %d\n", value, err);



git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@229392 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt