linux-user: Avoid redundant ENV_GET_CPU()

This fixes a mismerge in 874ec3c5b3.

Acked-by: Riku Voipio <riku.voipio@iki.fi>
Signed-off-by: Andreas Färber <afaerber@suse.de>

linux-user/main.c

@@ -3637,7 +3637,7 @@ int main(int argc, char **argv, char **envp)
         exit(1);
     }
     cpu = ENV_GET_CPU(env);
-    cpu_reset(ENV_GET_CPU(env));
+    cpu_reset(cpu);
 
     thread_cpu = cpu;