Fix a typo in gc_config_macros.h comment (redundant "an" article)

* include/gc_config_macros.h (GC_ADD_CALLER): Fix a typo in comment
(redundant "an" article).

diff --git a/include/gc_config_macros.h b/include/gc_config_macros.h
index 7e96757..3c49fe0 100644 (file)
--- a/include/gc_config_macros.h
+++ b/include/gc_config_macros.h
@@ -307,7 +307,7 @@
 # define GC_CAN_SAVE_CALL_STACKS
 #endif
 
-/* If we're on an a platform on which we can't save call stacks, but    */
+/* If we're on a platform on which we can't save call stacks, but       */
 /* gcc is normally used, we go ahead and define GC_ADD_CALLER.          */
 /* We make this decision independent of whether gcc is actually being   */
 /* used, in order to keep the interface consistent, and allow mixing    */