powerpc/procfs: Propagate error of remap_pfn_range()
If the operation fails and userspace is unaware it will access unmapped memory, crashing the process. Signed-off-by:Thomas Weißschuh <thomas.weissschuh@linutronix.de> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/all/20241010-vdso-generic-base-v1-22-b64f0842d512@linutronix.de
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