cfgfile: fix uninitialized variable on load error

CID 13323:
Uninitialized scalar variable. Using uninitialized value
cfg->num_sections when calling rte_cfgfile_close.

Fixes: eaafbad419 ("cfgfile: library to interpret config files")

Signed-off-by: Michal Kobylinski <michalx.kobylinski@intel.com>
Acked-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>

lib/librte_cfgfile/rte_cfgfile.c

@@ -232,6 +232,7 @@ rte_cfgfile_load(const char *filename, int flags)
 	return cfg;
 
 error1:
+	cfg->num_sections = curr_section + 1;
 	rte_cfgfile_close(cfg);
 error2:
 	fclose(f);