adbd: Remove check for set_supplementary_gids.

With https://android-review.googlesource.com/#/c/195400, Minijail will
check for this failure so there's no need to do it here, which allows
to simplify the code.

Bug: 26099611
Change-Id: I7c876fdcab874ed403f82bdd5a4048c0f1e5db58
diff --git a/adb/daemon/main.cpp b/adb/daemon/main.cpp
index 78db69d..4721e2f 100644
--- a/adb/daemon/main.cpp
+++ b/adb/daemon/main.cpp
@@ -124,12 +124,9 @@
                       AID_INET,     AID_NET_BT,    AID_NET_BT_ADMIN,
                       AID_SDCARD_R, AID_SDCARD_RW, AID_NET_BW_STATS,
                       AID_READPROC};
-    if (minijail_set_supplementary_gids(
-            jail.get(),
-            sizeof(groups) / sizeof(groups[0]),
-            groups) != 0) {
-        LOG(FATAL) << "Could not configure supplementary groups";
-    }
+    minijail_set_supplementary_gids(jail.get(),
+                                    sizeof(groups) / sizeof(groups[0]),
+                                    groups);
 
     // Don't listen on a port (default 5037) if running in secure mode.
     // Don't run as root if running in secure mode.