Removed duplicated words in in comments and docs.
diff --git a/Python/random.c b/Python/random.c
index 0776bfc..1e5776d 100644
--- a/Python/random.c
+++ b/Python/random.c
@@ -274,7 +274,7 @@
 }
 
 /* Fill buffer with size pseudo-random bytes from the operating system random
-   number generator (RNG). It is suitable for for most cryptographic purposes
+   number generator (RNG). It is suitable for most cryptographic purposes
    except long living private keys for asymmetric encryption.
 
    Return 0 on success, raise an exception and return -1 on error. */