util-host-info: fix memleaks

This fixes pcre related memory leak in SCKernelVersionIsAtLeast
function.

src/util-host-info.c

@@ -86,6 +86,8 @@ int SCKernelVersionIsAtLeast(int major, int minor)
     kminor = atoi(list[2]);
 
     pcre_free_substring_list(list);
+    pcre_free_study(version_regex_study);
+    pcre_free(version_regex);
 
     if (kmajor > major)
         return 1;