cmd/read.c: Fix checking blk_dread return value

The function blk_dread will return -ENOSYS on failure or on success the
number of blocks read, which must be the number asked to read (otherwise
it failed somewhere).  Correct this check.

Reported-by: Coverity (CID: 166335)
Cc: Philipp Tomsich <[email protected]>
Cc: Simon Glass <[email protected]>
Cc: Bin Meng <[email protected]>
Signed-off-by: Tom Rini <[email protected]>

Author: trini

cmd/read.c

@@ -66,7 +66,7 @@ int do_read(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 		return 1;
 	}
 
-	if (blk_dread(dev_desc, offset + blk, cnt, addr) < 0) {
+	if (blk_dread(dev_desc, offset + blk, cnt, addr) != cnt) {
 		printf("Error reading blocks\n");
 		return 1;
 	}