MINOR: Fix an error message thrown when we run out of memory

Fixes a typo in an error message that can be seen by the end user when
the haproxy subsystem runs out of memory.
diff --git a/src/haproxy.c b/src/haproxy.c
index b240bb3..93d6aa3 100644
--- a/src/haproxy.c
+++ b/src/haproxy.c
@@ -765,7 +765,7 @@
 	return;
 
 alloc_error:
-	ha_warning("Failed to reexecute the master processs [%d]: Cannot allocate memory\n", pid);
+	ha_warning("Failed to reexecute the master process [%d]: Cannot allocate memory\n", pid);
 	return;
 }