cifs: Use ULL suffix for 64-bit constant

On 32-bit (e.g. with m68k-linux-gnu-gcc-4.1):

fs/cifs/inode.c: In function ‘simple_hashstr’:
fs/cifs/inode.c:713: warning: integer constant is too large for ‘long’ type

Fixes: 7ea884c77e5c97f1 ("smb3: Fix root directory when server returns inode number of zero")
Signed-off-by: Geert Uytterhoeven <[e-mail]>
Signed-off-by: Steve French <[e-mail]>
Reviewed-by: Aurelien Aptel <[e-mail]>

fs/cifs/inode.c

···
 /* Simple function to return a 64 bit hash of string.  Rarely called */
 static __u64 simple_hashstr(const char *str)
 {
-	const __u64 hash_mult =  1125899906842597L; /* a big enough prime */
+	const __u64 hash_mult =  1125899906842597ULL; /* a big enough prime */
 	__u64 hash = 0;
 
 	while (*str)