mem-ruby, gpu-compute: fix typo in GPU coalescer deadlock print (#535)

mem-ruby, gpu-compute: fix typo in GPU coalescer deadlock print 
 
The GPU Coalescer's deadlock print did not previously print a newline at
the end of each deadlock, which caused confusion when there were
multiple deadlocks as each deadlock print would appear to go with the
address after it. This patch fixes this issue.

src/mem/ruby/system/GPUCoalescer.cc

@@ -344,7 +344,8 @@ GPUCoalescer::printRequestTable(std::stringstream& ss)
                << "\t\tIssue time: "
                << request->getIssueTime() * clockPeriod() << "\n"
                << "\t\tDifference from current tick: "
-               << (curCycle() - request->getIssueTime()) * clockPeriod();
+               << (curCycle() - request->getIssueTime()) * clockPeriod()
+               << "\n";
         }
     }