perf/core: Fix error handling in perf_event_alloc()
We don't set an error code here which means that perf_event_alloc() returns ERR_PTR(0) (in other words NULL). The callers are not expecting that and would Oops. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Fixes: 375637bc ("perf/core: Introduce address range filtering") Link: http://lkml.kernel.org/r/20170522090418.hvs6icgpdo53wkn5@mwandaSigned-off-by: Ingo Molnar <mingo@kernel.org>
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