applets/usage_pod.c: placate gcc

"error: format not a string literal and no format arguments"

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

applets/usage_pod.c

@@ -71,7 +71,7 @@ int main(void)
 		} else {
 			printf(", ");
 		}
-		printf(usage_array[i].aname);
+		printf("%s", usage_array[i].aname);
 		col += len2;
 	}
 	printf("\n\n");