Avoid warning:
cmd_bootm.c: In function 'bootm_load_os':
cmd_bootm.c:394: warning: passing argument 2 of
	'lzmaBuffToBuffDecompress' from incompatible pointer type
For 32 bit systems, this change shouldn't make a difference to code size
since sizeof(size_t) and sizeof(unsigned int) are equal.  But it does fix
the warning.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
                break;
 #endif /* CONFIG_BZIP2 */
 #ifdef CONFIG_LZMA
-       case IH_COMP_LZMA:
+       case IH_COMP_LZMA: {
+               SizeT lzma_len = unc_len;
                printf ("   Uncompressing %s ... ", type_name);
 
                int ret = lzmaBuffToBuffDecompress(
-                       (unsigned char *)load, &unc_len,
+                       (unsigned char *)load, &lzma_len,
                        (unsigned char *)image_start, image_len);
+               unc_len = lzma_len;
                if (ret != SZ_OK) {
                        printf ("LZMA: uncompress or overwrite error %d "
                                "- must RESET board to recover\n", ret);
                }
                *load_end = load + unc_len;
                break;
+       }
 #endif /* CONFIG_LZMA */
 #ifdef CONFIG_LZO
        case IH_COMP_LZO: