Fix signed/unsigned warnings.

crypto/rc4/rc4test.c

@@ -216,11 +216,11 @@ int main(int argc, char *argv[])
 		if (memcmp(md,expected,sizeof(md))) {
 			printf("error in RC4 bulk test\n");
 			printf("output:");
-			for (j=0; j<sizeof(md); j++)
+			for (j=0; j<(int)sizeof(md); j++)
 				printf(" %02x",md[j]);
 			printf("\n");
 			printf("expect:");
-			for (j=0; j<sizeof(md); j++)
+			for (j=0; j<(int)sizeof(md); j++)
 				printf(" %02x",expected[j]);
 			printf("\n");
 			err++;

engines/e_cswift.c

@@ -1062,7 +1062,7 @@ static int cswift_rand_bytes(unsigned char *buf, int num)
 	/* limitation of cswift with values not a multiple of 32                */
 	/************************************************************************/
 
-	while(num >= sizeof(buf32))
+	while(num >= (int)sizeof(buf32))
 	{
 		largenum.value = buf;
 		largenum.nbytes = sizeof(buf32);

ssl/d1_both.c

@@ -1228,7 +1228,7 @@ dtls1_min_mtu(void)
 static unsigned int 
 dtls1_guess_mtu(unsigned int curr_mtu)
 	{
-	int i;
+	unsigned int i;
 
 	if ( curr_mtu == 0 )
 		return g_probable_mtu[0] ;