r.out.ppm: Fix buffer issues in main.c #5904
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This pull request fixes issue identified by Coverity Scan (CID : 1208236)
Used G_strlcpy() and G_strlcat() to fix this issue.
For G_strlcat(), added a return value check with G_fatal_error() instead of silencing it with (void) (not sure whether it would fit within 1000 characters), even though the buffer ofile is 1000 bytes wide.