Merge pull request #2125 from visitorckw/fix-libradamsa-signed-intege…

…r-overflow

Fix signed integer overflow in radamsa

custom_mutators/radamsa/libradamsa.c

@@ -3707,7 +3707,7 @@ typedef intptr_t wdiff;
  1024 * 1024 * 8 /* static malloc'd heap size if used as a library */
 #define FBITS 24 /* bits in fixnum, on the way to 24 and beyond */
 #define FMAX \
- ((1 << FBITS) - 1) /* maximum fixnum (and most negative fixnum) \
+ ((1U << FBITS) - 1) /* maximum fixnum (and most negative fixnum) \
  */
 #define MAXOBJ 0xffff /* max words in tuple including header */
 #define MAXPAYL \