modpost: Fix processing of CRCs on 32-bit build machines

modpost now reads CRCs from .*.cmd files, parsing them using strtol().
This is inconsistent with its parsing of Module.symvers and with their
definition as *unsigned* 32-bit values.

strtol() clamps values to [LONG_MIN, LONG_MAX], and when building on a
32-bit system this changes all CRCs >= 0x80000000 to be 0x7fffffff.

Change extract_crcs_for_object() to use strtoul() instead.

Cc: stable@vger.kernel.org
Fixes: f292d875 ("modpost: extract symbol versions from *.cmd files")
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

scripts/mod/modpost.c

@@ -1733,7 +1733,7 @@ static void extract_crcs_for_object(const char *object, struct module *mod)
 		if (!isdigit(*p))
 			continue;	/* skip this line */
 
-		crc = strtol(p, &p, 0);
+		crc = strtoul(p, &p, 0);
 		if (*p != '\n')
 			continue;	/* skip this line */