[PATCH] bitmap: fix n__ signess

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

All callers of the bitmap_switch macro (which are all within bitmap.h)
pass an int as first parameter. Do not assign it to an unsigned int
potentially introducing errors.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxx>
---

We could also have gone the other way and change all the callers and the
callers' callers to use an unsigned int instead, but I went for the path
of least resistance.

diff --git a/xen/include/xen/bitmap.h b/xen/include/xen/bitmap.h
index 3caf92c76d..7caec098d7 100644
--- a/xen/include/xen/bitmap.h
+++ b/xen/include/xen/bitmap.h
@@ -101,7 +101,7 @@ extern int bitmap_allocate_region(unsigned long *bitmap, 
int pos, int order);
 #define bitmap_bytes(nbits) (BITS_TO_LONGS(nbits) * sizeof(unsigned long))
 
 #define bitmap_switch(nbits, zero, small, large)                         \
-       unsigned int n__ = (nbits);                                       \
+       int n__ = (nbits);                                        \
        if (__builtin_constant_p(nbits) && !n__) {                        \
                zero;                                                     \
        } else if (__builtin_constant_p(nbits) && n__ <= BITS_PER_LONG) { \