Correct style.

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
diff --git a/library/md.c b/library/md.c
index bc0a115..90c6bff 100644
--- a/library/md.c
+++ b/library/md.c
@@ -144,10 +144,10 @@
 static const int supported_digests[] = {
 
 #if defined(MBEDTLS_SHA3_C)
-        MBEDTLS_MD_SHA3_512,
-        MBEDTLS_MD_SHA3_384,
-        MBEDTLS_MD_SHA3_256,
-        MBEDTLS_MD_SHA3_224,
+    MBEDTLS_MD_SHA3_512,
+    MBEDTLS_MD_SHA3_384,
+    MBEDTLS_MD_SHA3_256,
+    MBEDTLS_MD_SHA3_224,
 #endif
 
 #if defined(MBEDTLS_SHA512_C)