Added parameter checking for read_part().

git-svn-id: https://urjtag.svn.sourceforge.net/svnroot/urjtag/trunk@87 b68d4a1b-bc3d-0410-92ed-d4ac073336b7

jtag/src/part/parse.c

@@ -41,8 +41,12 @@ part *
 read_part( FILE *f )
 {
 	int line = 0;
+	part *part;
 
-	part *part = part_alloc();
+	if (!f)
+		return NULL;
+
+	part = part_alloc();
 	if (!part) {
 		printf( "out of memory\n" );
 		return NULL;