drm/amdgpu: Check if fru_addr is not NULL (v2)

Always check if fru_addr is not NULL. This commit also fixes a "smatch"
warning.

v2: Add a Fixes tag.

Cc: Alex Deucher <Alexander.Deucher@amd.com>
Cc: Dan Carpenter <error27@gmail.com>
Cc: kernel test robot <lkp@intel.com>
Cc: AMD Graphics <amd-gfx@lists.freedesktop.org>
Fixes: afbe5d1e ("drm/amdgpu: Bug-fix: Reading I2C FRU data on newer ASICs")
Signed-off-by: Luben Tuikov <luben.tuikov@amd.com>
Reviewed-by: Kent Russell <kent.russell@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.c

@@ -64,7 +64,8 @@ static bool is_fru_eeprom_supported(struct amdgpu_device *adev, u32 *fru_addr)
 			    sizeof(atom_ctx->vbios_version)) ||
 		    strnstr(atom_ctx->vbios_version, "D163",
 			    sizeof(atom_ctx->vbios_version))) {
-			*fru_addr = FRU_EEPROM_MADDR_6;
+			if (fru_addr)
+				*fru_addr = FRU_EEPROM_MADDR_6;
 			return true;
 		} else {
 			return false;
@@ -83,7 +84,8 @@ static bool is_fru_eeprom_supported(struct amdgpu_device *adev, u32 *fru_addr)
 				    sizeof(atom_ctx->vbios_version))) {
 				return false;
 			} else {
-				*fru_addr = FRU_EEPROM_MADDR_6;
+				if (fru_addr)
+					*fru_addr = FRU_EEPROM_MADDR_6;
 				return true;
 			}
 		} else {