modlib:Allow loading elf from block devices

Signed-off-by: anjiahao <anjiahao@xiaomi.com>

libs/libc/modlib/modlib_init.c

@@ -70,14 +70,6 @@ static inline int modlib_fileinfo(FAR struct mod_loadinfo_s *loadinfo)
       return -errval;
     }
 
-  /* Verify that it is a regular file */
-
-  if (!S_ISREG(buf.st_mode))
-    {
-      berr("ERROR: Not a regular file.  mode: %d\n", buf.st_mode);
-      return -ENOENT;
-    }
-
   /* Return some stats info of the file in the loadinfo structure */
 
   loadinfo->filelen  = buf.st_size;