Fix several coverity warnings

290424 Missing break in switch - In hash_match: Missing break
statement between cases in switch statement

290414 Resource leak - In cli_scanishield_msi: Leak of memory or
pointers to system resources. Memory leak in a fail case

288197 Resource leak - In decrypt_any: Leak of memory or pointers
to system resources. Memory leak in a fail case

290426 Resource leak - In cli_magic_scan: Leak of memory or pointers
to system resources. Leaked a file prefix when running with
--save-temps

192923 Resource leak - In cli_scanrar: Leak of memory or pointers to
system resources. Leaked a file descriptor if a virus was found in
a RAR file comment

225146 Resource leak - In cli_scanegg: Leak of memory or pointers
to system resources. Leaked a file descriptor if unable to write
a comment file to disk

290425 Resource leak - In scan_common: Leak of memory or pointers
to system resources. Memory leaks in various fail cases.

Also changes cli_scanrar to write out the file comment only if
--leave-temps is specified and scan the buffer (like what is done
in cli_scanegg) instead of writing the file out, scanning that,
and then deleting the file if --leave-temps is not specified.

The unit tests stopped working when correcting an issue with a
switch statement that determined what type of signature had matched
on a Google SafeBrowsing GDB rule. Looking into the unit tests, it
looks like the code had always assumed that the test cases would be
detected by a malware test rule in unit_tests/input/daily.gdb, but
now some of the tests get matched on the phishing test rule.
I updated the test logic to be more clear, and added tests for both
cases now.

Fix some memory leaks in libclamav/scanners.c

libclamav/regex_list.c

@@ -472,6 +472,9 @@ cl_error_t load_regex_matcher(struct cl_engine *engine, struct regex_matcher *ma
         if (!*buffer)
             continue; /* skip empty lines */
 
+        if (buffer[0] == '#')
+            continue;
+
         if (functionality_level_check(buffer))
             continue;