target/loongarch: Prefer fast cpu_env() over slower CPU QOM cast macro

Mechanical patch produced running the command documented
in scripts/coccinelle/cpu_env.cocci_template header.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20240129164514.73104-16-philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
[thuth: Adjusted patch for hunk that moved to cpu_helper.c]
Signed-off-by: Thomas Huth <thuth@redhat.com>
diff --git a/target/loongarch/gdbstub.c b/target/loongarch/gdbstub.c
index 22c6889..a0e1439 100644
--- a/target/loongarch/gdbstub.c
+++ b/target/loongarch/gdbstub.c
@@ -33,8 +33,7 @@
 
 int loongarch_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n)
 {
-    LoongArchCPU *cpu = LOONGARCH_CPU(cs);
-    CPULoongArchState *env = &cpu->env;
+    CPULoongArchState *env = cpu_env(cs);
     uint64_t val;
 
     if (0 <= n && n < 32) {
@@ -60,8 +59,7 @@
 
 int loongarch_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
 {
-    LoongArchCPU *cpu = LOONGARCH_CPU(cs);
-    CPULoongArchState *env = &cpu->env;
+    CPULoongArchState *env = cpu_env(cs);
     target_ulong tmp;
     int read_length;
     int length = 0;