[FYI] Use pulongest in aarch64-linux-tdep.c

[Tom Tromey <tom@tromey.com>]

I tried a build on macOS today and it failed due to a mismatch between
the printf format and the type in aarch64-linux-tdep.c.  This patch
fixes the problem by using pulongest and %s rather than %ld.

gdb/ChangeLog
2018-10-02  Tom Tromey  <tom@tromey.com>

	* aarch64-linux-tdep.c (aarch64_linux_sigframe_init): Use pulongest.
---
 gdb/ChangeLog            | 4 ++++
 gdb/aarch64-linux-tdep.c | 4 ++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/gdb/aarch64-linux-tdep.c b/gdb/aarch64-linux-tdep.c
index e55b1a726f..f2962075c5 100644
--- a/gdb/aarch64-linux-tdep.c
+++ b/gdb/aarch64-linux-tdep.c
@@ -247,8 +247,8 @@ aarch64_linux_sigframe_init (const struct tramp_frame *self,
 	    vq = sve_vq_from_vl (extract_unsigned_integer (buf, 2, byte_order));
 
 	    if (vq != tdep->vq)
-	      error (_("Invalid vector length in signal frame %d vs %ld."), vq,
-		     tdep->vq);
+	      error (_("Invalid vector length in signal frame %d vs %s."), vq,
+		     pulongest (tdep->vq));
 
 	    if (size >= AARCH64_SVE_CONTEXT_SIZE (vq))
 	      sve_regs = section + AARCH64_SVE_CONTEXT_REGS_OFFSET;
-- 
2.17.1