Cleanup !! for bool

!!x makes no sense if x is bool (this is a leftover from the
convertion pa_bool_t -> bool, d806b197)

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>

src/pulsecore/pid.c

@@ -174,7 +174,7 @@ static int proc_name_ours(pid_t pid, const char *procname) {
         }
 /*#endif*/
 
-        return !!good;
+        return good;
     }
 #else