* backends/exec : fix inversion of shared option

src/backends/exec.c

@@ -187,7 +187,7 @@ config(cfg_t *cfg, const char *key, const char *value) {
     return true;
   }
   if (strcmp(key, "shared") == 0) {
-    cfg->shared = (strcmp(value, "yes") ? true : false);
+    cfg->shared = (strcmp(value, "yes") == 0) ? true : false;
     return true;
   }