hw/misc: Simplify memory_region_init_ram_from_fd() calls

Mechanical change using the following coccinelle script:

@@
expression mr, owner, arg3, arg4, arg5, arg6, arg7, errp;
@@
-   memory_region_init_ram_from_fd(mr, owner, arg3, arg4, arg5, arg6, arg7, &errp);
    if (
-       errp
+       !memory_region_init_ram_from_fd(mr, owner, arg3, arg4, arg5, arg6, arg7, &errp)
    ) {
        ...
        return;
    }

and removing the local Error variable.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Message-Id: <20231120213301.24349-24-philmd@linaro.org>

hw/misc/ivshmem.c

@@ -476,7 +476,6 @@ static void setup_interrupt(IVShmemState *s, int vector, Error **errp)
 
 static void process_msg_shmem(IVShmemState *s, int fd, Error **errp)
 {
-    Error *local_err = NULL;
     struct stat buf;
     size_t size;
 
@@ -496,10 +495,9 @@ static void process_msg_shmem(IVShmemState *s, int fd, Error **errp)
     size = buf.st_size;
 
     /* mmap the region and map into the BAR2 */
-    memory_region_init_ram_from_fd(&s->server_bar2, OBJECT(s), "ivshmem.bar2",
-                                   size, RAM_SHARED, fd, 0, &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
+    if (!memory_region_init_ram_from_fd(&s->server_bar2, OBJECT(s),
+                                        "ivshmem.bar2", size, RAM_SHARED,
+                                        fd, 0, errp)) {
         return;
     }