libmetal: set ept address loop++ in bitmap

CPU0                                CPU1
create_ept1:addr1                   create_ept1
OK                       <======    msg1
OK                       <======    msg2
OK                       <======    msg3
                           msg4
                         <======    msg4 on the virtioqueue
close_ept1                          close_ept1

create_ept2:addr1                   create_ept1
(same addr with ept1)
                           msg4
ept2 recv ept1 msg ERROR <======

The msg4 which belong to ep1, error received by ept2.

For the issue, I give a resolve method,
for the rpmsg_get_address(), always return a new increased num.

Signed-off-by: Guiding Li <[email protected]>

lib/utilities.h

@@ -134,10 +134,10 @@ metal_bitmap_next_clear_bit(unsigned long *bitmap, unsigned int start,
 	unsigned int bit;
 
 	for (bit = start;
-	     bit < max && !metal_bitmap_is_bit_clear(bitmap, bit);
+	     bit < max + start && !metal_bitmap_is_bit_clear(bitmap, bit % max);
 	     bit++)
 		;
-	return bit;
+	return bit % max;
 }
 
 #define metal_bitmap_for_each_clear_bit(bitmap, bit, max)		\