pgcrypto: Remove unused error code

PXE_MCRYPT_INTERNAL was apparently never used even when it was added.

contrib/pgcrypto/px.c

@@ -55,7 +55,6 @@ static const struct error_desc px_err_list[] = {
 	{PXE_ARGUMENT_ERROR, "Illegal argument to function"},
 	{PXE_UNKNOWN_SALT_ALGO, "Unknown salt algorithm"},
 	{PXE_BAD_SALT_ROUNDS, "Incorrect number of rounds"},
-	{PXE_MCRYPT_INTERNAL, "mcrypt internal error"},
 	{PXE_NO_RANDOM, "Failed to generate strong random bits"},
 	{PXE_DECRYPT_FAILED, "Decryption failed"},
 	{PXE_ENCRYPT_FAILED, "Encryption failed"},

contrib/pgcrypto/px.h

@@ -58,7 +58,7 @@
 #define PXE_ARGUMENT_ERROR			-13
 #define PXE_UNKNOWN_SALT_ALGO		-14
 #define PXE_BAD_SALT_ROUNDS			-15
-#define PXE_MCRYPT_INTERNAL			-16
+/* -16 is unused */
 #define PXE_NO_RANDOM				-17
 #define PXE_DECRYPT_FAILED			-18
 #define PXE_ENCRYPT_FAILED			-19