[PATCH] gas: fix building tc-bpf.c on s390x

[Ilya Leoshkevich]

char is unsigned on s390x, so there are a lot of warnings like:

    gas/config/tc-bpf.c: In function 'get_token':
    gas/config/tc-bpf.c:900:14: error: comparison is always false due to limited range of data type [-Werror=type-limits]
      900 |       if (ch == EOF || len > MAX_TOKEN_SZ)
          |              ^~

Make ch explicitly signed.

There is also:

    gas/config/tc-bpf.c:735:30: error: 'bpf_endianness' may be used uninitialized in this function [-Werror=maybe-uninitialized]
      735 |    dst, be ? size[endianness - BPF_BE16] : size[endianness - BPF_LE16]);
          |                   ~~~~~~~~~~~^~~~~~~~~~

-Wmaybe-uninitialized doesn't seem to understand the FSM; just
initialize bpf_endianness to silence it.
---
 gas/config/tc-bpf.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gas/config/tc-bpf.c b/gas/config/tc-bpf.c
index 171fc682806..adcf5edc645 100644
--- a/gas/config/tc-bpf.c
+++ b/gas/config/tc-bpf.c
@@ -885,7 +885,7 @@ get_token (const char **insn, char *token, size_t *tlen)
     } while (0)
 
   const char *str = *insn;
-  char ch, ch2 = 0;
+  signed char ch, ch2 = 0;
   enum bpf_token_type ttype = BPF_UNKNOWN;
   size_t len = 0;
   const char *expr = NULL;
@@ -1362,7 +1362,7 @@ bpf_pseudoc_to_normal_syntax (const char *str, char **errmsg)
     } while (0)
 
   enum bpf_token_type ttype;
-  enum bpf_token_type bpf_endianness,
+  enum bpf_token_type bpf_endianness = BPF_UNKNOWN,
 		      bpf_atomic_insn;
   enum bpf_token_type bpf_jmp_op = BPF_JEQ; /* Arbitrary.  */
   enum bpf_token_type bpf_cast = BPF_CAST_U8; /* Arbitrary.  */
-- 
2.40.0