powerpc/fadump: skip parameter area allocation when fadump is disabled

Fadump allocates memory to pass additional kernel command-line argument
to the fadump kernel. However, this allocation is not needed when fadump
is disabled. So avoid allocating memory for the additional parameter
area in such cases.

Fixes: f4892c68ecc1 ("powerpc/fadump: allocate memory for additional parameters early")
Reviewed-by: Hari Bathini <[e-mail]>
Signed-off-by: Sourabh Jain <[e-mail]>
Fixes: f4892c68ecc1 ("powerpc/fadump: allocate memory for additional parameters early")
Signed-off-by: Madhavan Srinivasan <[e-mail]>
Link: https://patch.msgid.link/[e-mail]

arch/powerpc/kernel/fadump.c

···
 {
 	phys_addr_t range_start, range_end;
 
+	if (!fw_dump.fadump_enabled)
+		return;
+
 	if (!fw_dump.param_area_supported || fw_dump.dump_active)
 		return;