diff --git a/qemu-nbd.c b/qemu-nbd.c
index bdac1f3f1f..899e67cfd7 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -288,19 +288,19 @@ static void *nbd_client_thread(void *arg)
     ret = nbd_receive_negotiate(sock, NULL, &nbdflags,
                                 &size, &blocksize);
     if (ret < 0) {
-        goto out;
+        goto out_socket;
     }
 
     fd = open(device, O_RDWR);
     if (fd < 0) {
         /* Linux-only, we can use %m in printf.  */
         fprintf(stderr, "Failed to open %s: %m", device);
-        goto out;
+        goto out_socket;
     }
 
     ret = nbd_init(fd, sock, nbdflags, size, blocksize);
     if (ret < 0) {
-        goto out;
+        goto out_fd;
     }
 
     /* update partition table */
@@ -316,12 +316,16 @@ static void *nbd_client_thread(void *arg)
 
     ret = nbd_client(fd);
     if (ret) {
-        goto out;
+        goto out_fd;
     }
     close(fd);
     kill(getpid(), SIGTERM);
     return (void *) EXIT_SUCCESS;
 
+out_fd:
+    close(fd);
+out_socket:
+    closesocket(sock);
 out:
     kill(getpid(), SIGTERM);
     return (void *) EXIT_FAILURE;
@@ -355,6 +359,11 @@ static void nbd_accept(void *opaque)
     socklen_t addr_len = sizeof(addr);
 
     int fd = accept(server_fd, (struct sockaddr *)&addr, &addr_len);
+    if (fd < 0) {
+        perror("accept");
+        return;
+    }
+
     if (state >= TERMINATE) {
         close(fd);
         return;
diff --git a/rules.mak b/rules.mak
index 9dda9f760f..5c454d80d5 100644
--- a/rules.mak
+++ b/rules.mak
@@ -23,8 +23,8 @@ QEMU_DGFLAGS += -MMD -MP -MT $@ -MF $(*D)/$(*F).d
 QEMU_INCLUDES += -I$(<D) -I$(@D)
 
 maybe-add = $(filter-out $1, $2) $1
-extract-libs = $(strip $(sort $(foreach o,$1,$($o-libs)) \
-                  $(foreach o,$(call expand-objs,$1),$($o-libs))))
+extract-libs = $(strip $(sort $(foreach o,$1,$($o-libs))) \
+                  $(foreach o,$(call expand-objs,$1),$($o-libs)))
 expand-objs = $(strip $(sort $(filter %.o,$1)) \
                   $(foreach o,$(filter %.mo,$1),$($o-objs)) \
                   $(filter-out %.o %.mo,$1))
diff --git a/target-alpha/translate.c b/target-alpha/translate.c
index a9ef1a7507..e7e319b31d 100644
--- a/target-alpha/translate.c
+++ b/target-alpha/translate.c
@@ -1927,6 +1927,7 @@ static ExitStatus translate_one(DisasContext *ctx, uint32_t insn)
                     else {
                         tcg_gen_neg_i64(cpu_ir[rc], cpu_ir[rb]);
                         tcg_gen_ext32s_i64(cpu_ir[rc], cpu_ir[rc]);
+                    }
                 }
             }
             break;
@@ -1991,7 +1992,7 @@ static ExitStatus translate_one(DisasContext *ctx, uint32_t insn)
                 } else {
                     if (islit)
                         tcg_gen_movi_i64(cpu_ir[rc], -lit);
-                    else
+                    else {
                         tcg_gen_neg_i64(cpu_ir[rc], cpu_ir[rb]);
                         tcg_gen_ext32s_i64(cpu_ir[rc], cpu_ir[rc]);
                     }
diff --git a/vl.c b/vl.c
index 842e897d75..b363a21779 100644
--- a/vl.c
+++ b/vl.c
@@ -2651,15 +2651,20 @@ static MachineClass *machine_parse(const char *name)
     if (mc) {
         return mc;
     }
-    printf("Supported machines are:\n");
-    for (el = machines; el; el = el->next) {
-        MachineClass *mc = el->data;
-        QEMUMachine *m = mc->qemu_machine;
-        if (m->alias) {
-            printf("%-20s %s (alias of %s)\n", m->alias, m->desc, m->name);
+    if (name && !is_help_option(name)) {
+        error_report("Unsupported machine type");
+        error_printf("Use -machine help to list supported machines!\n");
+    } else {
+        printf("Supported machines are:\n");
+        for (el = machines; el; el = el->next) {
+            MachineClass *mc = el->data;
+            QEMUMachine *m = mc->qemu_machine;
+            if (m->alias) {
+                printf("%-20s %s (alias of %s)\n", m->alias, m->desc, m->name);
+            }
+            printf("%-20s %s%s\n", m->name, m->desc,
+                   m->is_default ? " (default)" : "");
         }
-        printf("%-20s %s%s\n", m->name, m->desc,
-               m->is_default ? " (default)" : "");
     }
 
     g_slist_free(machines);