video: fbdev: nvidiafb: Use strscpy() to prevent buffer overflow

In the Linux kernel, the following vulnerability has been resolved:

video: fbdev: nvidiafb: Use strscpy() to prevent buffer overflow

Coverity complains of a possible buffer overflow. However,

given the 'static' scope of nvidia_setup_i2c_bus() it looks

like that can't happen after examiniing the call sites.

CID 19036 (#1 of 1): Copy into fixed size buffer (STRING_OVERFLOW)

1. fixed_size_dest: You might overrun the 48-character fixed-size string

chan->adapter.name by copying name without checking the length.

2. parameter_as_source: Note: This defect has an elevated risk because the

source argument is a parameter of the current function.

89 strcpy(chan->adapter.name, name);

Fix this warning by using strscpy() which will silence the warning and

prevent any future buffer overflows should the names used to identify the

channel become much longer.