bootstage: Correct exhasuted typo

Correct this typo in the warning message shown when no more bootstage
records can be added.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/common/bootstage.c b/common/bootstage.c
index a68d883..0e6d807 100644
--- a/common/bootstage.c
+++ b/common/bootstage.c
@@ -137,7 +137,7 @@
 			rec->flags = flags;
 			rec->id = id;
 		} else {
-			log_warning("Bootstage space exhasuted\n");
+			log_warning("Bootstage space exhausted\n");
 		}
 	}