mtd: spi-nor: fix flash probing

Fix flash probing by name. Flash entries without a name are allowed
since commit 15eb830 ("mtd: spi-nor: mark the flash name as
obsolete"). But it was just until recently that a flash entry without a
name was actually introduced. This triggers a bug in the legacy probe by
name path. Skip entries without a name to fix it.

Fixes: 2095e7d ("mtd: spi-nor: spansion: Add support for S28HS256T")
Reported-by: Jon Hunter <[email protected]>
Closes: https://lore.kernel.org/r/[email protected]/
Tested-by: Jon Hunter <[email protected]>
Signed-off-by: Michael Walle <[email protected]>
Reviewed-by: Tudor Ambarus <[email protected]>
Reviewed-by: Pratyush Yadav <[email protected]>
Signed-off-by: Pratyush Yadav <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: mwalle

drivers/mtd/spi-nor/core.c

@@ -3281,7 +3281,8 @@ static const struct flash_info *spi_nor_match_name(struct spi_nor *nor,
 
 	for (i = 0; i < ARRAY_SIZE(manufacturers); i++) {
 		for (j = 0; j < manufacturers[i]->nparts; j++) {
-			if (!strcmp(name, manufacturers[i]->parts[j].name)) {
+			if (manufacturers[i]->parts[j].name &&
+			    !strcmp(name, manufacturers[i]->parts[j].name)) {
 				nor->manufacturer = manufacturers[i];
 				return &manufacturers[i]->parts[j];
 			}