[PATCH][GCC][AArch64]: Replace sprintf call with snprintf in aarch64.md

[Alex Butler]

Replaced for consistency with the rest of the aarch64 backend.

Testing done:
Cross-compiled and regression tested on aarch64-none-elf, no issues.

---
gcc/ChangeLog:

2020-04-08  Alex Butler  <alex.but...@arm.com>

        * config/aarch64/aarch64.md (cb<optab><mode>1): Replace
        sprintf with snprintf

---
 aarch64.md |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)  

diff --git a/gcc/config/aarch64/aarch64.md b/gcc/config/aarch64/aarch64.md
index 
c7c4d1dd519af6c9df03ba74e7b6ade5f122b4d8..94247cf019e1701843d3a77b352c0b81dec4fbff
 100644
--- a/gcc/config/aarch64/aarch64.md
+++ b/gcc/config/aarch64/aarch64.md
@@ -953,7 +953,7 @@
            char buf[64];
            uint64_t val = ((uint64_t) 1)
                << (GET_MODE_SIZE (<MODE>mode) * BITS_PER_UNIT - 1);
-           sprintf (buf, "tst\t%%<w>0, %" PRId64, val);
+           snprintf (buf, 64, "tst\t%%<w>0, %" PRId64, val);
            output_asm_insn (buf, operands);
            return "<bcond>\t%l1";
          }