fix various typos in comments.

common/lib/libc/stdlib: Fix possible signed integer overflow.

common/lib/libc/stdlib/random.c:482:6 can result in signed integer overflow.

This bug was reported by UBSan runs.

The change has been

common/lib/libc/stdlib: Fix possible signed integer overflow.

common/lib/libc/stdlib/random.c:482:6 can result in signed integer overflow.

This bug was reported by UBSan runs.

The change has been tested using the following program to generate random numbers
in both the old and the new library and can be used to verify the correctness of the
library after the change.

#include <stdio.h>
#include <stdlib.h>

#define COUNT 1000 * 1000

int
main(void)
{
int i;
FILE *fp = fopen("numbers.txt", "w");

srandom(0xdeadbeef);

for(i = 0; i < COUNT; i++) {
fprintf(fp, "%ld\n", random());
}

fclose(fp);

return 0;
}

Reviewed by: riastradh@ , kamil@

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whitespace

update for the new function signatures of initstate/srandom

Add the old small random from the libkern and use it for now.

Make this compile for the kernel again.

Merge libkern + libc common files. As requested by core.