reboot: fix variable assignments in type_store

Clang warns:

kernel/reboot.c:707:17: warning: implicit conversion from enumeration
type 'enum reboot_type' to different enumeration type 'enum reboot_mode'
[-Wenum-conversion]
                reboot_mode = BOOT_TRIPLE;
                            ~ ^~~~~~~~~~~
kernel/reboot.c:709:17: warning: implicit conversion from enumeration
type 'enum reboot_type' to different enumeration type 'enum reboot_mode'
[-Wenum-conversion]
                reboot_mode = BOOT_KBD;
                            ~ ^~~~~~~~
kernel/reboot.c:711:17: warning: implicit conversion from enumeration
type 'enum reboot_type' to different enumeration type 'enum reboot_mode'
[-Wenum-conversion]
                reboot_mode = BOOT_BIOS;
                            ~ ^~~~~~~~~
kernel/reboot.c:713:17: warning: implicit conversion from enumeration
type 'enum reboot_type' to different enumeration type 'enum reboot_mode'
[-Wenum-conversion]
                reboot_mode = BOOT_ACPI;
                            ~ ^~~~~~~~~
kernel/reboot.c:715:17: warning: implicit conversion from enumeration
type 'enum reboot_type' to different enumeration type 'enum reboot_mode'
[-Wenum-conversion]
                reboot_mode = BOOT_EFI;
                            ~ ^~~~~~~~
kernel/reboot.c:717:17: warning: implicit conversion from enumeration
type 'enum reboot_type' to different enumeration type 'enum reboot_mode'
[-Wenum-conversion]
                reboot_mode = BOOT_CF9_FORCE;
                            ~ ^~~~~~~~~~~~~~
kernel/reboot.c:719:17: warning: implicit conversion from enumeration
type 'enum reboot_type' to different enumeration type 'enum reboot_mode'
[-Wenum-conversion]
                reboot_mode = BOOT_CF9_SAFE;
                            ~ ^~~~~~~~~~~~~
7 warnings generated.

It seems that these assignment should be to reboot_type, not
reboot_mode. Fix it so there are no more warnings and the code works
properly.

Link: https://lkml.kernel.org/r/20201112035023.974748-1-natechancellor@gmail.com
Fixes: eab8da4 ("reboot: allow to specify reboot mode via sysfs")
Link: ClangBuiltLinux#1197
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Matteo Croce <mcroce@microsoft.com>
Tested-by: Matteo Croce <mcroce@microsoft.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Kees Cook <keescook@chromium.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Tyler Hicks <tyhicks@linux.microsoft.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

kernel/reboot.c

@@ -704,19 +704,19 @@ static ssize_t type_store(struct kobject *kobj, struct kobj_attribute *attr,
 		return -EPERM;
 
 	if (!strncmp(buf, BOOT_TRIPLE_STR, strlen(BOOT_TRIPLE_STR)))
-		reboot_mode = BOOT_TRIPLE;
+		reboot_type = BOOT_TRIPLE;
 	else if (!strncmp(buf, BOOT_KBD_STR, strlen(BOOT_KBD_STR)))
-		reboot_mode = BOOT_KBD;
+		reboot_type = BOOT_KBD;
 	else if (!strncmp(buf, BOOT_BIOS_STR, strlen(BOOT_BIOS_STR)))
-		reboot_mode = BOOT_BIOS;
+		reboot_type = BOOT_BIOS;
 	else if (!strncmp(buf, BOOT_ACPI_STR, strlen(BOOT_ACPI_STR)))
-		reboot_mode = BOOT_ACPI;
+		reboot_type = BOOT_ACPI;
 	else if (!strncmp(buf, BOOT_EFI_STR, strlen(BOOT_EFI_STR)))
-		reboot_mode = BOOT_EFI;
+		reboot_type = BOOT_EFI;
 	else if (!strncmp(buf, BOOT_CF9_FORCE_STR, strlen(BOOT_CF9_FORCE_STR)))
-		reboot_mode = BOOT_CF9_FORCE;
+		reboot_type = BOOT_CF9_FORCE;
 	else if (!strncmp(buf, BOOT_CF9_SAFE_STR, strlen(BOOT_CF9_SAFE_STR)))
-		reboot_mode = BOOT_CF9_SAFE;
+		reboot_type = BOOT_CF9_SAFE;
 	else
 		return -EINVAL;