Backport TERMKEY_FLAG_NOSTART and fix two leaks

...that are notably still present in the original library.

README.adoc

@@ -39,7 +39,7 @@ statically linked against the library, and hence they can be run as they are:
 
 What's Different From the Original termkey?
 -------------------------------------------
-The main change is throwing away any UTF-8 dependent code, making the library
+The main change is throwing out any UTF-8 dependent code, making the library
 capable of handling all unibyte and multibyte encodings supported by iconv on
 your system.  The characters are still presented as Unicode in the end, however,
 as the other sensible option is wchar_t and that doesn't really work well, see

termo.c

@@ -425,12 +425,12 @@ termo_new (int fd, const char *encoding, int flags)
 	termo_set_flags (tk, flags);
 
 	const char *term = getenv ("TERM");
-	if (termo_init (tk, term, encoding)
-	 && termo_start (tk))
+	if (!termo_init (tk, term, encoding))
+		free (tk);
+	else if (!(flags & TERMO_FLAG_NOSTART) && !termo_start (tk))
+		termo_free (tk);
+	else
 		return tk;
-
-	// FIXME: resource leak on termo_start() failure
-	free (tk);
 	return NULL;
 }
 
@@ -445,13 +445,12 @@ termo_new_abstract (const char *term, const char *encoding, int flags)
 	termo_set_flags (tk, flags);
 
 	if (!termo_init (tk, term, encoding))
-	{
 		free (tk);
-		return NULL;
-	}
-
-	termo_start (tk);
-	return tk;
+	else if (!(flags & TERMO_FLAG_NOSTART) && !termo_start (tk))
+		termo_free (tk);
+	else
+		return tk;
+	return NULL;
 }
 
 void

termo.h

@@ -192,7 +192,9 @@ enum
 	// Allow Ctrl-C to be read as normal, disabling SIGINT
 	TERMO_FLAG_CTRLC       = 1 << 6,
 	// Return ERROR on signal (EINTR) rather than retry
-	TERMO_FLAG_EINTR       = 1 << 7
+	TERMO_FLAG_EINTR       = 1 << 7,
+	// Do not call termkey_start() in constructor
+	TERMO_FLAG_NOSTART     = 1 << 8
 };
 
 enum