orangefs: make open_for_read and open_for_write boolean

orangefs: make open_for_read and open_for_write boolean

sparse currently warns:

fs/orangefs/file.c:119:32: warning: incorrect type in assignment (different base types)
fs/orangefs/file.c:119:32:    expected int open_for_write
fs/orangefs/file.c:119:32:    got restricted fmode_t

Turning open_for_write and open_for_read into booleans (which is how
they're used) removes this warning.

Signed-off-by: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Link: https://lore.kernel.org/r/20250305204734.1475264-4-willy@infradead.org
Tested-by: Mike Marshall <hubcap@omnibond.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>