viewer/svutil: Fix memory leak

Coverity report:

CID 1164728 (#1 of 1): Resource leak (RESOURCE_LEAK)
33. leaked_storage: Variable argv going out of scope leaks the storage it points to.

Signed-off-by: Stefan Weil <sw@weilnetz.de>

viewer/svutil.cpp

@@ -118,6 +118,9 @@ void SVSync::StartProcess(const char* executable, const char* args) {
     }
     argv[argc] = NULL;
     execvp(executable, argv);
+    free(argv[0]);
+    free(argv[1]);
+    delete[] argv;
   }
 #endif
 }