wmail: fixed possible NULL-pointer dereference in config-parser.

The code calling Tokenize assumed that if it returned true, value would
not be NULL.  However, in the case of a line containing no equals sign:

  blah

that would not be the case.  Changed Tokenize to return false unless id
and value are both defined.

wmail/src/config.c

@@ -124,6 +124,7 @@ static bool Tokenize( const char *line, const char **id, const char **value )
 	{
 	    token2 = strchr( token1, '=' );
 	    if( token2 != NULL )
+	    {
 		token2 = SkipWhiteSpaces( token2 + 1 );
 
 		if( !IsWhiteSpace( token2 ))
@@ -135,6 +136,7 @@ static bool Tokenize( const char *line, const char **id, const char **value )
 		}
 	    }
 	}
+    }
 
     return false;
 }