fix trailing white spaces
diff --git a/include/mbedtls/ctr_drbg.h b/include/mbedtls/ctr_drbg.h
index 1323043..f0f8163 100644
--- a/include/mbedtls/ctr_drbg.h
+++ b/include/mbedtls/ctr_drbg.h
@@ -8,9 +8,9 @@
* Recommendation for Random Number Generation Using Deterministic Random
* Bit Generators</em>.
*
- * The Mbed TLS implementation of CTR_DRBG uses AES-256 (default) or AES-128
+ * The Mbed TLS implementation of CTR_DRBG uses AES-256 (default) or AES-128
* as the underlying block cipher.
- *
+ *
* * \warning ARC4 is considered a weak cipher and its use constitutes a
* security risk. We recommend considering stronger ciphers instead.
*/
@@ -48,14 +48,14 @@
#define MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR -0x003A /**< Read or write error in file. */
#define MBEDTLS_CTR_DRBG_BLOCKSIZE 16 /**< The block size used by the cipher. */
-#if defined(MBEDTLS_CTR_DRBG_KEY_SIZE_256)
+#if defined(MBEDTLS_CTR_DRBG_KEY_SIZE_256)
#define MBEDTLS_CTR_DRBG_KEYSIZE 32 /**< The key size used by the cipher. */
-#else
-#if defined(MBEDTLS_CTR_DRBG_KEY_SIZE_128)
+#else
+#if defined(MBEDTLS_CTR_DRBG_KEY_SIZE_128)
#warning Warning: using smaller (128bit) key size for CTR DRBG may reduce the security of some operations.
#define MBEDTLS_CTR_DRBG_KEYSIZE 16 /**< The key size used by the cipher. */
-#else
-#error for ctr DRBG either MBEDTLS_CTR_DRBG_KEYSIZE_256 (default) or MBEDTLS_CTR_DRBG_KEYSIZE_128 must be set
+#else
+#error for ctr DRBG either MBEDTLS_CTR_DRBG_KEY_SIZE_256 (default) or MBEDTLS_CTR_DRBG_KEY_SIZE_128 must be set
#endif
#endif
#define MBEDTLS_CTR_DRBG_KEYBITS ( MBEDTLS_CTR_DRBG_KEYSIZE * 8 ) /**< The key size for the DRBG operation, in bits. */