fix several problems with config parser:

 a bug where it underflows the string
 a bug where it never frees parser_t struct
make read_config() return 0 if parser is NULL,
 make config_close() accept and ignore NULL parser -
 eliminates many if() blocks
reverse the sense of parser bit flags - negative flags
 are harder to grok.
hexdump: revert the change to use config parser, it is BIGGER
 and also requires additional quirks in parser
*: explicitly use PARSER_NORMAL instead of 0

function                                             old     new   delta
login_main                                          1575    1596     +21
config_close                                          18      29     +11
bbunpack                                             383     391      +8
qgravechar                                           106     109      +3
rtnl_tab_initialize                                  121     117      -4
expand                                              1697    1693      -4
man_main                                             717     712      -5
nameif_main                                          674     668      -6
hexdump_main                                         597     591      -6
read_config                                          217     209      -8
dnsd_main                                           1478    1470      -8
sysctl_main                                          203     189     -14
config_open2                                          44      25     -19
make_device                                         1177    1141     -36
config_read                                          597     549     -48
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 4/11 up/down: 43/-158)         Total: -115 bytes

1 files changed, 1 insertions, 1 deletions

diff --git a/modutils/modprobe-small.c b/modutils/modprobe-small.c
index 1654cc52d..63be9aadb 100644
--- a/modutils/modprobe-small.c
+++ b/modutils/modprobe-small.c
@@ -491,7 +491,7 @@ static int already_loaded(const char *name)
 	int ret = 0;
 	char *s;
 	parser_t *parser = config_open2("/proc/modules", xfopen_for_read);
-	while (config_read(parser, &s, 1, 1, "# \t", 0)) {
+	while (config_read(parser, &s, 1, 1, "# \t", PARSE_NORMAL & ~PARSE_GREEDY)) {
 		if (strcmp(s, name) == 0) {
 			ret = 1;
 			break;