fs/proc/vmcore.c: Convert to use vmf_error()

This code can be replaced with vmf_error() inline function.

Link: http://lkml.kernel.org/r/20180918145945.GA11392@jordon-HP-15-Notebook-PCSigned-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Reviewed-by: Matthew Wilcox <willy@infradead.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/proc/vmcore.c

@@ -423,7 +423,7 @@ static vm_fault_t mmap_vmcore_fault(struct vm_fault *vmf)
 		if (rc < 0) {
 			unlock_page(page);
 			put_page(page);
-			return (rc == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS;
+			return vmf_error(rc);
 		}
 		SetPageUptodate(page);
 	}