fstrim: Use strtoull instead of strtoul

When we are parsing input arguments we should really use stroull to get
unsigned long long numbers, since this is what we can specify on the
command line. With this fix it should parse long numbers on the 32 bit
architecture correctly.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Reviewed-by: Alex Elder <aelder@sgi.com>

src/fstrim.c

@@ -97,7 +97,7 @@ static unsigned long long get_number(char **optarg)
 	}
 
 	errno = 0;
-	number = strtoul(opt, &end , 0);
+	number = strtoull(opt, &end , 0);
 	if (errno)
 		err_exit("%s: %s (%s)\n", program_name,
 			 strerror(errno), *optarg);