selftests/powerpc: remove unneeded semicolon

Eliminate the following coccicheck warning:
./tools/testing/selftests/powerpc/nx-gzip/gzfht_test.c:327:4-5: Unneeded
semicolon
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1612780870-95890-1-git-send-email-yang.lee@linux.alibaba.com

tools/testing/selftests/powerpc/nx-gzip/gzfht_test.c

@@ -324,7 +324,7 @@ int compress_file(int argc, char **argv, void *handle)
 				fprintf(stderr, "error: cannot progress; ");
 				fprintf(stderr, "too many faults\n");
 				exit(-1);
-			};
+			}
 		}
 
 		fault_tries = NX_MAX_FAULTS; /* Reset for the next chunk */