shared: fix a typo in a comment

Signed-off-by: Abdur Rehman <arehmanq199@gmail.com>
Reviewed-by: Yong Bakos <ybakos@humanoriented.com>

shared/os-compatibility.c

@@ -144,7 +144,7 @@ create_tmpfile_cloexec(char *tmpname)
  *
  * If the C library implements posix_fallocate(), it is used to
  * guarantee that disk space is available for the file at the
- * given size. If disk space is insufficent, errno is set to ENOSPC.
+ * given size. If disk space is insufficient, errno is set to ENOSPC.
  * If posix_fallocate() is not supported, program may receive
  * SIGBUS on accessing mmap()'ed file contents instead.
  */