block: Rename variable to avoid shadowing

bdrv_open() uses two different variables called options. Rename one of
them to avoid confusion and to allow the outer one to be accessed
everywhere.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

block.c

@@ -896,7 +896,7 @@ int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,
         BlockDriverState *bs1;
         int64_t total_size;
         BlockDriver *bdrv_qcow2;
-        QEMUOptionParameter *options;
+        QEMUOptionParameter *create_options;
         char backing_filename[PATH_MAX];
 
         /* if snapshot, we create a temporary backing file and open it
@@ -928,17 +928,19 @@ int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,
         }
 
         bdrv_qcow2 = bdrv_find_format("qcow2");
-        options = parse_option_parameters("", bdrv_qcow2->create_options, NULL);
+        create_options = parse_option_parameters("", bdrv_qcow2->create_options,
+                                                 NULL);
 
-        set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size);
-        set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename);
+        set_option_parameter_int(create_options, BLOCK_OPT_SIZE, total_size);
+        set_option_parameter(create_options, BLOCK_OPT_BACKING_FILE,
+                             backing_filename);
         if (drv) {
-            set_option_parameter(options, BLOCK_OPT_BACKING_FMT,
+            set_option_parameter(create_options, BLOCK_OPT_BACKING_FMT,
                 drv->format_name);
         }
 
-        ret = bdrv_create(bdrv_qcow2, tmp_filename, options);
-        free_option_parameters(options);
+        ret = bdrv_create(bdrv_qcow2, tmp_filename, create_options);
+        free_option_parameters(create_options);
         if (ret < 0) {
             goto fail;
         }