[PATCH 13/35] libfdt: fdt_get_string(): Fix comparison warnings

[Sebastian Huber]

From: Simon Glass <sjg at chromium.org>

With -Wsign-compare, compilers warn about a mismatching signedness in
comparisons in fdt_get_string().

In the first two cases, we have just established that the signed values
are not negative, so it's safe to cast the values to an unsigned type.

Signed-off-by: Simon Glass <sjg at chromium.org>
Signed-off-by: Andre Przywara <andre.przywara at arm.com>
Message-Id: <20200921165303.9115-7-andre.przywara at arm.com>
Signed-off-by: David Gibson <david at gibson.dropbear.id.au>
---
 cpukit/dtc/libfdt/fdt_ro.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/cpukit/dtc/libfdt/fdt_ro.c b/cpukit/dtc/libfdt/fdt_ro.c
index 3c8d143db2..ddb5a2db28 100644
--- a/cpukit/dtc/libfdt/fdt_ro.c
+++ b/cpukit/dtc/libfdt/fdt_ro.c
@@ -53,7 +53,7 @@ const char *fdt_get_string(const void *fdt, int stroffset, int *lenp)
 
 	err = -FDT_ERR_BADOFFSET;
 	absoffset = stroffset + fdt_off_dt_strings(fdt);
-	if (absoffset >= totalsize)
+	if (absoffset >= (unsigned)totalsize)
 		goto fail;
 	len = totalsize - absoffset;
 
@@ -61,7 +61,7 @@ const char *fdt_get_string(const void *fdt, int stroffset, int *lenp)
 		if (stroffset < 0)
 			goto fail;
 		if (can_assume(LATEST) || fdt_version(fdt) >= 17) {
-			if (stroffset >= fdt_size_dt_strings(fdt))
+			if ((unsigned)stroffset >= fdt_size_dt_strings(fdt))
 				goto fail;
 			if ((fdt_size_dt_strings(fdt) - stroffset) < len)
 				len = fdt_size_dt_strings(fdt) - stroffset;
-- 
2.31.1