Fix ftbfs on Fedora 34

error: ordered comparison of pointer with integer zero ('int*' and 'int')

Signed-off-by: François Andriot <francois.andriot@free.fr>
(cherry picked from commit 322b12e44f)

src/modules/rijndael/libkvirijndael.cpp

@@ -277,7 +277,7 @@
 			setLastError(__tr("The message is not a hexadecimal string: this is not my stuff"));
 			return false;
 		} else {
-			if(len > 0)
+			if(*len > 0)
 			{
 				*outBuffer = (char *)kvi_malloc(*len);
 				kvi_memmove(*outBuffer,tmpBuf,*len);
@@ -303,7 +303,7 @@
 			setLastError(__tr("The message is not a base64 string: this is not my stuff"));
 			return false;
 		} else {
-			if(len > 0)
+			if(*len > 0)
 			{
 				*outBuffer = (char *)kvi_malloc(*len);
 				kvi_memmove(*outBuffer,tmpBuf,*len);