Fix the behavior of vulkan::driver::Debuggable() function

Bug: 144169750
Test: Vulkan app on user build is unable to load implicit layers by default
Change-Id: Ief47c6daaa7d5722920e0fd75183d35ae2362adb
diff --git a/vulkan/libvulkan/driver.cpp b/vulkan/libvulkan/driver.cpp
index a544bc5..0b686f1 100644
--- a/vulkan/libvulkan/driver.cpp
+++ b/vulkan/libvulkan/driver.cpp
@@ -756,7 +756,7 @@
 }  // anonymous namespace
 
 bool Debuggable() {
-    return (prctl(PR_GET_DUMPABLE, 0, 0, 0, 0) >= 0);
+    return prctl(PR_GET_DUMPABLE, 0, 0, 0, 0) > 0;
 }
 
 bool OpenHAL() {