Fix valgrind complaints when using kill -SIGHUP on libvirtd

This patch fixes a couple of complaints from valgrind when tickling libvirtd with SIGHUP.

The first two files contain fixes for memory leaks. The 3rd one initializes an uninitialized variable. The 4th one is another memory leak.

src/conf/nwfilter_conf.c

@@ -2239,6 +2239,7 @@ virNWFilterPoolObjLoad(virConnectPtr conn,
         return NULL;
     }
 
+    VIR_FREE(pool->configFile); // for driver reload
     pool->configFile = strdup(path);
     if (pool->configFile == NULL) {
         virReportOOMError();

src/conf/storage_conf.c

@@ -1403,12 +1403,14 @@ virStoragePoolObjLoad(virStoragePoolObjListPtr pools,
         return NULL;
     }
 
+    VIR_FREE(pool->configFile);  // for driver reload
     pool->configFile = strdup(path);
     if (pool->configFile == NULL) {
         virReportOOMError();
         virStoragePoolDefFree(def);
         return NULL;
     }
+    VIR_FREE(pool->autostartLink); // for driver reload
     pool->autostartLink = strdup(autostartLink);
     if (pool->autostartLink == NULL) {
         virReportOOMError();

src/cpu/cpu_x86.c

@@ -1092,6 +1092,12 @@ x86MapFree(struct x86_map *map)
         x86ModelFree(model);
     }
 
+    while (map->vendors != NULL) {
+        struct x86_vendor *vendor = map->vendors;
+        map->vendors = vendor->next;
+        x86VendorFree(vendor);
+    }
+
     VIR_FREE(map);
 }
 

src/util/util.c

@@ -941,9 +941,11 @@ virPipeReadUntilEOF(int outfd, int errfd,
 
     fds[0].fd = outfd;
     fds[0].events = POLLIN;
+    fds[0].revents = 0;
     finished[0] = 0;
     fds[1].fd = errfd;
     fds[1].events = POLLIN;
+    fds[1].revents = 0;
     finished[1] = 0;
 
     while(!(finished[0] && finished[1])) {