Revert "Prevent crash if *line == NULL"

This reverts commit b72f9516ac.

src/spicelib/parser/inpgtok.c

@@ -31,9 +31,6 @@ INPgetTok(char **line, char **token, int gobble)
     char *point;
     int signstate;
 
-    if (!*line)
-        return (E_PARMVAL);
-
     /* scan along throwing away garbage characters until end of line
        or a separation char is found */
     for (point = *line; *point != '\0'; point++) {