[PATCH] gdb/microblaze-tdep.c: Check whether less than zero in conditional expression

[Chen Gang <gang.chen.5i5j@gmail.com>]

Use typecast 'size_t' on 'reg', not only avoid the related warning, but
also check whether less than zero -- for 'reg' is type 'int', and sizeof
(dwarf2_to_reg_map) is less than 0x7fff.

It is quoted in gdb_assert(), so need check 'reg' whether less than zero.
And the related warning (with '-W'):

  ../../binutils-gdb/gdb/microblaze-tdep.c:667:3: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]

ChangeLog:

 * microblaze-tdep.c (microblaze_dwarf2_reg_to_regnum): Check whether
 less tha zero in conditional expression.


Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
---
 gdb/microblaze-tdep.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gdb/microblaze-tdep.c b/gdb/microblaze-tdep.c
index 7e89241..9bec260 100644
--- a/gdb/microblaze-tdep.c
+++ b/gdb/microblaze-tdep.c
@@ -664,7 +664,7 @@ static int dwarf2_to_reg_map[78] =
 static int
 microblaze_dwarf2_reg_to_regnum (struct gdbarch *gdbarch, int reg)
 {
-  gdb_assert (reg < sizeof (dwarf2_to_reg_map));
+  gdb_assert ((size_t) reg < sizeof (dwarf2_to_reg_map));
   return dwarf2_to_reg_map[reg];
 }
 
-- 
1.7.11.7