Kernel/LibC: remove SYS_TERMID

This syscall is not needed. /dev/tty is already a symlink to the
controlling terminal. Also this syscall did not handle pseudo terminals

kernel/include/kernel/Process.h

@@ -218,8 +218,6 @@ namespace Kernel
 		BAN::ErrorOr<long> sys_tcgetpgrp(int fd);
 		BAN::ErrorOr<long> sys_tcsetpgrp(int fd, pid_t pgid);
 
-		BAN::ErrorOr<long> sys_termid(char*);
-
 		BAN::ErrorOr<long> sys_clock_gettime(clockid_t, timespec*);
 
 		BAN::ErrorOr<long> sys_load_keymap(const char* path);

kernel/kernel/Process.cpp

@@ -2741,26 +2741,7 @@ namespace Kernel
 		return 0;
 	}
 
-	BAN::ErrorOr<long> Process::sys_termid(char* buffer)
 	{
-		LockGuard _(m_process_lock);
-
-		TRY(validate_string_access(buffer));
-
-		auto& tty = m_controlling_terminal;
-
-		if (!tty)
-			buffer[0] = '\0';
-		else
-		{
-			ASSERT(minor(tty->rdev()) < 10);
-			strcpy(buffer, "/dev/tty0");
-			buffer[8] += minor(tty->rdev());
-		}
-
-		return 0;
-	}
-
 	BAN::ErrorOr<long> Process::sys_clock_gettime(clockid_t clock_id, timespec* tp)
 	{
 		LockGuard _(m_process_lock);

userspace/libraries/LibC/include/sys/syscall.h

@@ -9,7 +9,6 @@ __BEGIN_DECLS
 	O(SYS_EXIT,				exit)			\
 	O(SYS_READ,				read)			\
 	O(SYS_WRITE,			write)			\
-	O(SYS_TERMID,			termid)			\
 	O(SYS_CLOSE,			close)			\
 	O(SYS_OPENAT,			openat)			\
 	O(SYS_SEEK,				seek)			\

userspace/libraries/LibC/stdio.cpp

@@ -138,7 +138,7 @@ char* ctermid(char* buffer)
 {
 	static char s_buffer[L_ctermid];
 	char* target = buffer ? buffer : s_buffer;
-	syscall(SYS_TERMID, target);
+	strcpy(buffer, "/dev/tty");
 	return target;
 }