Fixes to minor Coverity errors:

75424
73422
72724
72702
72662

server/core/config.c

@@ -1268,7 +1268,7 @@ SERVER			*server;
 										(PERCENT_TYPE|COUNT_TYPE));
 							}
 							
-                                                        if (!succp)
+                                                        if (!succp && param != NULL)
                                                         {
                                                                 LOGIF(LM, (skygw_log_write(
                                                                         LOGFILE_MESSAGE,
@@ -1362,7 +1362,7 @@ SERVER			*server;
 						if (enable_root_user && service)
 							serviceEnableRootUser(service, atoi(enable_root_user));
 
-						if (allow_localhost_match_wildcard_host)
+						if (allow_localhost_match_wildcard_host && service)
 							serviceEnableLocalhostMatchWildcardHost(
 								service,
 								atoi(allow_localhost_match_wildcard_host));

server/core/gateway.c

@@ -1479,7 +1479,11 @@ int main(int argc, char **argv)
 		bool succp;
 
                 sprintf(buf, "%s/log", home_dir);
-                mkdir(buf, 0777);
+				if(mkdir(buf, 0777) != 0){
+					fprintf(stderr,
+							"Error: Cannot create log directory: %s\n",buf);
+					goto return_main;
+				}
                 argv[0] = "MaxScale";
                 argv[1] = "-j";
                 argv[2] = buf;