test: regex: Make testregex return error count

Testregex returned 0 even when some sub-tests
inside the testregex failed. Now it returns error
count.

Signed-off-by: Vlad Zakharov <vzakhar@synopsys.com>

test/regex/testregex.c

@@ -2115,7 +2115,7 @@ old_main(int unused_param_argc, char** argv)
 		if (fp != stdin)
 			fclose(fp);
 	}
-	return 0;
+	return state.errors;
 }
 
 int main(int argc, char **argv)