[Comgr] Fix issue in which Path memory freed before return

Previously we freed "Line" before returning. However the StringRef
Path, which was built from the StringRef vector Tokens, depends on
Line, instead of making a copy.

Change-Id: I4861e0cca5c59458f731a7ecb523ac009d285bb0

Author: lamb-j

lib/comgr/src/comgr-env.cpp

@@ -137,9 +137,10 @@ std::string getComgrInstallPathFromExecutable() {
         return "";
       }
 
+      std::string rv = StripGNUInstallLibDir(Path).str();
       fclose(ProcMaps);
       free(Line);
-      return StripGNUInstallLibDir(Path).str();
+      return rv;
     }
   }