Fix multiplication converted to larger type

This fixes the instances of the "Multiplication result converted to 
larger type" alert that codeQL scanning found.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Signed-off-by: Andrew Innes <andrew.c12@gmail.com>
Closes openzfs#14094

cmd/raidz_test/raidz_test.c

@@ -937,7 +937,7 @@ run_sweep(void)
 		opts = umem_zalloc(sizeof (raidz_test_opts_t), UMEM_NOFAIL);
 		opts->rto_ashift = ashift_v[a];
 		opts->rto_dcols = dcols_v[d];
-		opts->rto_offset = (1 << ashift_v[a]) * rand();
+		opts->rto_offset = (1ULL << ashift_v[a]) * rand();
 		opts->rto_dsize = size_v[s];
 		opts->rto_expand = rto_opts.rto_expand;
 		opts->rto_expand_offset = rto_opts.rto_expand_offset;

lib/libefi/rdwr_efi.c

@@ -1362,7 +1362,7 @@ efi_write(int fd, struct dk_gpt *vtoc)
 	if (NBLOCKS(vtoc->efi_nparts, vtoc->efi_lbasize) < 34) {
 		dk_ioc.dki_length = EFI_MIN_ARRAY_SIZE + vtoc->efi_lbasize;
 	} else {
-		dk_ioc.dki_length = NBLOCKS(vtoc->efi_nparts,
+		dk_ioc.dki_length = (len_t)NBLOCKS(vtoc->efi_nparts,
 		    vtoc->efi_lbasize) *
 		    vtoc->efi_lbasize;
 	}

module/zfs/arc.c

@@ -5136,7 +5136,7 @@ arc_adapt(int bytes, arc_state_t *state)
 		if (!zfs_arc_p_dampener_disable)
 			mult = MIN(mult, 10); /* avoid wild arc_p adjustment */
 
-		arc_p = MIN(arc_c - arc_p_min, arc_p + bytes * mult);
+		arc_p = MIN(arc_c - arc_p_min, arc_p + (uint64_t)bytes * mult);
 	} else if (state == arc_mfu_ghost) {
 		uint64_t delta;
 

tests/zfs-tests/cmd/stride_dd.c

@@ -25,8 +25,8 @@ static int bsize = 0;
 static int count = 0;
 static char *ifile = NULL;
 static char *ofile = NULL;
-static int stride = 0;
-static int seek = 0;
+static off_t stride = 0;
+static off_t seek = 0;
 static const char *execname = "stride_dd";
 
 static void usage(void);