allocator: bail if we can't sleep

sdk/core/allocator/main.cc

diff --git a/sdk/core/allocator/main.cc b/sdk/core/allocator/main.cc
index 359134c..865bc98 100644
--- a/sdk/core/allocator/main.cc
+++ b/sdk/core/allocator/main.cc
@@ -224,7 +224,10 @@
 			// Release the lock before sleeping
 			g.unlock();
 			Timeout smallSleep{1};
-			thread_sleep(&smallSleep);
+			if (thread_sleep(&smallSleep) < 0)
+			{
+				return false;
+			}
 			if (!reacquire_lock(timeout, g, smallSleep.elapsed))
 			{
 				return false;
@@ -313,7 +316,11 @@
 						// Sleep for a single tick.
 						g.unlock();
 						Timeout smallSleep{1};
-						thread_sleep(&smallSleep);
+						if (thread_sleep(&smallSleep) < 0)
+						{
+							/* Unable to sleep; bail out */
+							return nullptr;
+						}
 						if (!reacquire_lock(timeout, g, smallSleep.elapsed))
 						{
 							return nullptr;