fdtgrep: Fix logic of free() in do_fdtgrep()

This loop never actually exits, but the way the code is written this is
not obvious. Add an explicit error check.

Reported-by: Coverity (CID: 131280)
Signed-off-by: Simon Glass <sjg@chromium.org>
[trini: Add explicit init of region to NULL per LLVM warning]
Signed-off-by: Tom Rini <trini@konsulko.com>

tools/fdtgrep.c

@@ -773,7 +773,7 @@ char *utilfdt_read(const char *filename)
  */
 static int do_fdtgrep(struct display_info *disp, const char *filename)
 {
-	struct fdt_region *region;
+	struct fdt_region *region = NULL;
 	int max_regions;
 	int count = 100;
 	char path[1024];
@@ -801,7 +801,7 @@ static int do_fdtgrep(struct display_info *disp, const char *filename)
 	 * The first pass will count the regions, but if it is too many,
 	 * we do another pass to actually record them.
 	 */
-	for (i = 0; i < 3; i++) {
+	for (i = 0; i < 2; i++) {
 		region = malloc(count * sizeof(struct fdt_region));
 		if (!region) {
 			fprintf(stderr, "Out of memory for %d regions\n",
@@ -815,11 +815,14 @@ static int do_fdtgrep(struct display_info *disp, const char *filename)
 				disp->flags);
 		if (count < 0) {
 			report_error("fdt_find_regions", count);
+			free(region);
 			return -1;
 		}
 		if (count <= max_regions)
 			break;
 		free(region);
+		fprintf(stderr, "Internal error with fdtgrep_find_region)(\n");
+		return -1;
 	}
 
 	/* Optionally print a list of regions */