[PATCH] gdb: fix sparc build failure of linux-nat

[Sergei Trofimovich via Gdb-patches <gdb-patches@sourceware.org>]

From: Sergei Trofimovich <siarheit@google.com>

On sparc build failed as:

```
gdb/sparc-linux-nat.c: In member function
  'virtual void sparc_linux_nat_target::fetch_registers(regcache*, int)':
gdb/sparc-linux-nat.c:36:37:
  error: cannot convert 'regcache*' to 'process_stratum_target*'
   36 |   { sparc_fetch_inferior_registers (regcache, regnum); }
      |                                     ^~~~~~~~
      |                                     |
      |                                     regcache*
```

The fix adopts gdb/sparc-nat.h API change in d1e93af64a6
("gdb: set current thread in sparc_{fetch,collect}_inferior_registers").

gdb/ChangeLog:

	* sparc-linux-nat.c (sparc_linux_nat_target): fix sparc build
	by passing `process_stratum_target*` parameter.
---
 gdb/sparc-linux-nat.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gdb/sparc-linux-nat.c b/gdb/sparc-linux-nat.c
index c644d441228..33a17afa21e 100644
--- a/gdb/sparc-linux-nat.c
+++ b/gdb/sparc-linux-nat.c
@@ -33,10 +33,10 @@ class sparc_linux_nat_target final : public linux_nat_target
 public:
   /* Add our register access methods.  */
   void fetch_registers (struct regcache *regcache, int regnum) override
-  { sparc_fetch_inferior_registers (regcache, regnum); }
+  { sparc_fetch_inferior_registers (this, regcache, regnum); }
 
   void store_registers (struct regcache *regcache, int regnum) override
-  { sparc_store_inferior_registers (regcache, regnum); }
+  { sparc_store_inferior_registers (this, regcache, regnum); }
 };
 
 static sparc_linux_nat_target the_sparc_linux_nat_target;
-- 
2.31.1